RMRD7T7J–. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. CUCUMBER DISEASES—CUCUMBER PESTS 857 Massachusetts Experiment Station Bulle- tin 55. In thus handling the soil due time must be given for draining and dry- ^^^' A. D. Selby Powdery Mildew Erysiphe cichoracearum DC. Frequent in hothouses, but not trouble- some elsewhere. Selby recommends a dilute copper sulphate solution. Keference Ohio Experiment
RMRDE373–. Diseases of economic plants . Plant diseases. VEGETABLE AND FIELD CROPS 221 Powdery mildew (Erysiphe polygoni DC.)- — This mildew of the cucumber and cantaloupe in general appearance resembles that described for the grape. It is more com- mon under glass than in the open, and here indicates too much moisture and too little ven- tilation. It is sel- dom injurious in the field. Flowers of sul- phur applied to the hot water or steam pipes in the form of a paste is useful. Leaf blight, cer- cosporose {Cercos- pora Cucurbitoe Ell. &Ev.). —The spots of this disease are much hke those of altern
RMRE3MD2–. Introduction to cryptogamic botany. Cryptogams. INTRODUCTION TO ORYPTOGAMIC BOTANST. 275 280. One great peculiarity iu the genus Erysiphe, or the genera more immediately allied to it, consists in the variously shaped processes which at length radiate from the perithecia, and are at the same time altogether independent of the myce- liirni. few objects are more beautiful under a microscope of moderate powers (Fig. 64). The mycelium in these species is often pure white, but is sometimes tinged in parts with brown, and occasionally assumes a imiform brown tint, paving the way for Meliola. No spe
RMRDJ5D3–. Microbes, ferments and moulds . Bacteria; Fungi; Fermentation. PARASITIC FUNGI AND MOULDS. 27 produced in the yellow balls correspond with those which issue from the asci developed on the sclerotis; these are endogenous spores. Many of the parasitic fungi belonging to the genera Erysiphe, Sphceria, Sordaria, Penicillmi/m, etc, pre- sent a similar mode of vegetation, and affect a large number of plants. Such is the Oidvwm of the vine {Erysiphe Tuckeri) to which we shall presently revert. IV. OOMTCETES, MUCORINE^, OE MOULDS, PEOPEELY SO CALLED; PeRONOSPOEEJj; ; THE PoTATO-FUNGUS. In aU the par
RMRDDBXB–. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 173 This binucleate cell after fusion of its nuclei develops into the one ascus characteristic of the genus. The ascus nucleus by- division gives rise to the spore nuclei and the spores are cut out of the periplasm by reflexion of the astral rays. In Erysiphe** the oogonium and antheridium arise in a very similar way, the oogonium being somewhat curved. Feri;ilization is also similar consisting of the union of two gametic nuclei. After fertilization the oospore nucleus divides and the oogonium de
RMRDTP6D–. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. 82 PLECTOMYCETES [CH.. Fig. 39. Erysiphe Polygoni; young perithecium containing uninucleate asci; after Harper. which undergo a change apparently analogous to lignification. nPhyllactinia the outermost layer, from which the secondary mycelium and the character- istic appendages are derived, consists of thin-walled cells, but in other genera it is not differentiated from the pro- tective zone. A single asciis or several may be formed in the peri- thecium ; the ascospores, numbering two to eight in each ascus, begin to develop during the s
RMRDE5K5–. Fungoid and insect pests of the farm. Agricultural pests. 48 Mildews [CH. considering in the present chapter are spoken of as Powdery or Triie Mildews. The true mildews comprise a large number of different species. One of the commonest and also one which wiU serve as an example of the group is the well-known mildew of grasses and cereals, Erysiphe graminis.. We shall have Uttle difficulty in finding specimens of this disease in cornfields during the. Mg. 16. Wheat plant attacked by Erysiphe graminis. spring, especially if the weather has been dull or wet. In drier seasons it may be found in
RMRDE5JM–. Fungoid and insect pests of the farm. Agricultural pests. 52 Mildevjs [CH. as ascospores and the pear-shaped body containing them is known as an ascus. The wall of the spore case is composed of a number of polygonal cells, whose walls cause the polygonal markings on the outside. The spore cases are formed at the points where the hyphae touch one another, and each is the result of fertilization.. Fig. 18. Mycelium and spore cases of Erysiphe graminis. (Magnified.) Attached to them are a number of " appendages." In the case of Erysiphe graminis these are simple, un- branched, short h
RMRDJF9P–. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 228 FUNGOUS DISEASES OF PLANTS XXVI. MILDEW OF COMPOSITES AND OTHER PLANTS Erysiphe Cichoracearum De C. This species of mildew is also widely distributed and occurs upon more than two hundred hosts of numerous families. It is unusually common upon spe- cies of Compositse and in general is easily the most destructive fungus of these hosts. It is also well known to the florist upon species of phlox and to the gar- dener upon some' varieties of cucurbits. The fungus is often con- fuse
RMREF8FE–. Comparative morphology of Fungi. Fungi. PERISPORIALES 195 prefer damp climates. The only endophytic species, Leveillula taurica, belongs to dry subtropical regions whose phanerogams are generally xerophytes with a very thick epidermis. Further it appears that the Erysiphaceae in the tropics generally only propagate by imperfect forms and that the perithecia degenerate. They are also sharply specialized even in their ectophytism (Salmon, 1900, 1903; Steiner, 1908; Blumer, 1922; etc.). From the numerous forms so far studied, except for Erysiphe dehoracearum, none is able to go beyond a single
RMRG2M3Y–. The Canadian field-naturalist. . Figures 5-7. (5) Table Mountain, treeless top, with Woody Point in the distance, site of Exobasidium karstenii on Andromeda glaucophylla. (6) Green Garden Trail at coastline, site of Puccinia coronata on Shepherdia canadensis and Erysiphe polygoni on Ranunculus acris. (7) Cliffs at Cow Head lighthouse, site of Puccinia bistortae and Bostrichonema polygoni on Polygonum viviparum.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not
RMRDC27R–. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. PODOSPHAERA. 175 This mildew has inflicted great Dusting the threatened P. myrtillina Schub. on leaves of Vaccinium MyrtUlus (bil- berry), V. uliginosum, and JSmpetntm nigmm (crowberry), (U.S. America). Erysiphe. The perithecia contain several asci, each with two to eight oval hyaline spores. The appendages are like these of Sphae- rotheca, simple and thread-like. Erysiphe graminis D. C. Mould or mildew of grass and
RMRDD27Y–. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. Fig.6- adJaAbPodosphaeraCasla£^ei, Lev. «epidennalceUsof^'?to»yiyr««.^A'a^«MOT; abranchedmycelialhypha is creeping over tlie surface and tias sent a liaustorium into one of ttie cells (surface view). ^ vertical section through epidermal cells with mycelial hypha and a haustorium which has penetrated into a cell, c a spore (gonidium) of Erysiphe VmbeUiferarum putting forth germ-tuijes on the epidermis of Anthrisctis sylvtstris. The smaller gemi.tube on the right is sen
RMRDE6FY–. The fungi which cause plant disease . Plant diseases; Fungi. Recent tests by Westerdijk â '" indicate the absence of such biologic specialization in regard to hosts as is found in the Erysiphe and elsewhere. S. nicotianae Oud. & Kon.'*'' ^- parasitize;; the leaves and stems of tobacco. It is possibly identical with S. libertiana. S. trifolioruin Erik.^^-^" In general this resembles S. libertiana with which it is by some regarded as iden- tical; sufficient evidence has, however, not been adduced to prove them the same. The sclerotia, varying in size from that of a mustard seed t
RMRGWKF4–. Bulletin. Natural history; Natural history. 396 Illinois State Laboratory of Natural History.. Figure 4. Erysiphe chicoracearum, DC. A ruptured perithecium with thread-like appendages and protrud- ing asci, eacli containing two spores, — magnified 90 times. ^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural H
RMREF89J–. Comparative morphology of Fungi. Fungi. 210 COMPARATIVE MORPHOLOGY OF FUNGI direction of the Sphaeriales, it may become many layered. In many species, as in Erysiphe and Leveillula of the Erysiphaceae, it is symmetri- cal throughout the fructification; in others, as in Microsphaera and Uncinula, it is dorsiventral and is drawn out to a small wart or papilla at the tip; in other species, as in Meliola corallina (Fig. 132, 2), as a definite step in the direction of the Sphaeriales, a true opening, an ostiole, is formed at the top of the perithecium (Bucholtz, 1897). At times the perithecia, as
RMRGTN2T–. Bulletin. Natural history; Natural history. Parasitic Fungi of Illinois. 391. Figure 2. Clcinobolns Cessaiii, DBy.: a the mycelium of Erysiphe galeopsidis, DC, within which is to be seen the parasitic mycehum b of Cicinoblus; c, c, c different stages of the so-called pycnidium in which the spores of the parasite are developed. Magnified 300 times. (After De Bary.) Fig. 2. This frequently develops in one of the cells of a conidio- phore, in which case the shriveled upper portion remains as a kind of appendage. In other cases it is developed directly from the mycelium. Occasionally, on rupturi
RMRDG9KW–. Parasitic fungi of Illinois / by T.J. Burrill. Fungi. 396 ItUnois State Laboratory of J^aturat History.. FiGTTKB 4. Erysiphe chicoracearum, DO. A ruptured perithecium with, thread-like appendages and protrud- ing asci, each containing two spores, — magnified 90 times. Pig. 4. ^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Burrill, Thomas J. (Thomas Jonathan), 1839-1916; Earle, F. S. (Franklin Sumner), 1856-1929. Peori
RMRFRW8T–. Carnegie Institution of Washington publication. ' :.¥•;. o FIG. 4.—Mitosis in ascus of Erysiphe contmunis.—(After Harper. ) A, nucleus in resting stage of second nuclear generation in ascus, the flattened or disk-shaped centro- some closely applied to nuclear membrane. B, early prophase ; the kinoplasmic radiations have been developed about the centrosome. C, D, E, F, successive steps in development of spindle. G, mature spindle, the nuclear membrane still persists at sides. H, end of anaphase; connecting fibers extend between the daughter nuclei, which are not yet provided with a nuclear me
RMRGGNN4–. Bulletin of the Illinois State Laboratory of Natural History. Natural history -- Illinois. Parasitic Fungi of Illinois. 391. Figure 2. Cicinobolus Cessatii, DBy.: a the mycelium of Erysiphe galeopsidis, DC, within which is to be seen the parasitic mycehum b of Ckinohlus; c, c, c different stages of the so-called pycnidium in which the spores of the parasite are developed. Magnified 300 times. (After De Bary.) This frequently develops in one of the cells of a coniclio- phore, in which case the shriveled upper portion remains as a kind of appendage. In other cases it is developed directly from
RMRDGX8P–. The diseases of crops and their remedies : a handbook of economic biology for farmers and students. Plant diseases. 28 DISEASES OF CROPS. the larva of this insect causes considerable damage to the crops of Russia. Prevention.—As the caterpillars feed upon nettles and low-growing grasses, these should be cleared away. Cure.—A good dusting with lime or soot is a sure remedy for this pest. The Pea Mildew {Erysiphe Martii, Fig. 9) is very destructive, as it " grows on both sides of the leaves," causing white spots. The spores of this fungus throw out. >.zoo. Fig. 9.—Pea Mildew (Erys
RMRDE2W1–. Diseases of economic plants . Plant diseases. CEREALS 375 Anthracnose {Colletotrichum cereale Manns). — This an- thracnose seems to prevail on wheat as extensively as upon rye. Upon wheat the head or parts of it are not destroyed, as in the case of rye, but general weakness of the plant and light shriveled grain follows the attack. Powdery mildew (Erysiphe graminis DC). — The usual characters of the powdery mildews are exhibited: a whitish,. Fig. 160. —Normal wheat kernels and shriveled kernels due to anthracnose. After Manns. flour-like coating in irregular circular spots upon the leaves an
RMRDTP5D–. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. Fig. 43. Erysiphe Polygoni; rt. fertilization; b. young perithecium with ascogenous liyphae; after Harper. protective hyphae begin to grow up, the oogonium elongates, the fusion nucleus divides till a row of from five to eight nuclei is produced, transverse walls appear, and a row of cells is formed of which the penultimate contains two or more nuclei. From the surface of the penultimate cell, and perhaps sometimes from that of its neighbours, filaments bud out (fig. 43(5), branch rapidly to form a dense mass, and undergo septation. These
RMRDDYK4–. The diseases of crops and their remedies : a handbook of economic biology for farmers and students. Plant diseases. 28 DISEASES OF CROPS. tte larva of tlds insect causes considerable damage to the crops of Eussia. Prevention.—As the caterpUlars feed upon nettles and low-growing grasses, these should be cleared away. Cure.—A good dusting with lime or soot is a sure remedy for this pest. The Pea Mildew {Erysiphe Martii, Fig. 9) is very destructive, as it " grows on both sides of the leaves," causing white spots. The spores of this fungus throw out. Fig. 9.—Pea Mildew {Erysiphe Martii
RMRDG9M8–. Parasitic fungi of Illinois / by T.J. Burrill. Fungi. Parasitic Fungi of Illinois. 391. FiGUEB 2. Cicindbolus Cessatii, DBy.: a the mycelium of Erysiphe galeopsidis, DC, within which is to be sefen the parasitic mycelium 6 of Oidnoblus; c, c, c different stages of the so-called pycnidium in which the spores of the parasite are developed. Magnified 300 times. (After De Bary.) Fig. 2. This frequently develops in one of the cells of a conidio- phore, in which case the shriveled upper portion remains as a kind of appendage. In other cases it is developed directly from the mycelium. Occasionally,
RMRDDBWE–. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 179 and concludes that the same form of "Erysiphe cichoracearum D. C, occurs on at least eleven species of the cucurbits, belonging to seven genera, infection occurring in these cases in fifty per cent or more of the trials. Six other species were also infected, but in a smaller percentage of cases. ... It is also plain that the biologic form of Erysiphe cichoracearum, occurring on so many cucurbits is not entirely confined to the species of this one family. Out of fifty-four leaves of Plant
RMRGGNN0–. Bulletin of the Illinois State Laboratory of Natural History. Natural history -- Illinois. Illinois State Laboratory of NaturaljHistory.. FiGUEE 4. Erysiphe chicoracearum, DC. A ruptured perithecium with thread-like appendages and protrud- ing asci, each containing two spores, — magnified 90 times. n i^lk ^t4.l*' Figure 5. Uncinula am- pelopsidis, Peck: a, perithe- cium with the numerous appendages (6) coiled at the tip,— magnified 100 times; c, ^^^ one of the appendages (tip) further magnified; d,anas- cus with five spores,—magni- fied 200 times. The lower, pointed end of the ascus is atta
RMRDG9KN–. Parasitic fungi of Illinois / by T.J. Burrill. Fungi. FiGTTKB 4. Erysiphe chicoracearum, DO. A ruptured perithecium with, thread-like appendages and protrud- ing asci, each containing two spores, — magnified 90 times. Pig. 4. ^. Fig. 5. Figure 5. Undnula am- lis, Peck: a, perithe- cium with the numerous appendages (6) coiled at the tip,— magnified 100 times; c, i one of the appendages (tip) further magnified; d,anas- cus with five spores,—magni- fied 200 times. The lower, pointed end of the ascus is attached to the bottom of the cavity of the perithecium.. Please note that these images are e
RMRE3MCG–. Introduction to cryptogamic botany. Cryptogams. Fig. 64. a. Fulcra and asous, -with sporidia of Uiicinvla spiralis, Berk, and Curt. b. Peritliecium, with its numerous fulcra and ascus, of Erysiphe densa, Berk, and Curt. c. Ditto of Microsphcera semitosta, Berk, and Curt. d. Fiilcra of Uncinula adunca, L6v. e. Ditto of Microsphcera Mougeotii, L6v. All more or less magnified. From specimens communicated from tiie United States, by Eev. M. A. Curtis. 3. Sph^riacei, Ft. Perithecia free or immersed in a woody or variously consti- tuted stroma, opening by a distinct punctiform or short linear aper
RMRDTP65–. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. Ill] ERYSIPHALES 83 walled over its upper surface, but an oval region remains thin on the lower side. As the ripening perithecium loses water so do the appendages; the thin area below the bulb is pushed in by atmospheric pressure, the under surface becomes consequently shorter than the upper and the end of the spine is pulled down till subsequent moistening straightens it again (Harper).. Fig. 40. Perithecia of a. Erysiphe tortilis (Wallr.) Fr.; b. Mia-osphaeria sp. c Aceris (DC.) Sacc; d. Phyllactinia Corylea (Pers.) Karst.; x 120. Unci
RMRDTP4F–. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. Fig. 45. Phyllactinia CoryUa (Pers.) Karst.; peri- thecium containing uninucleate asci; after Harper.. p;vJv^K.y.j-;:v-a' Fig. 46. Phyllactinia Corylea (Pers.) Karst.; a. b. fusion in ascus; after Harper. Eight chromosomes (fig. 47) have been observed throughout the life- history. In Phyllactinia Corylea and also in Microsphaera ^/«? (Sands, 1907) and various species of Erysiphe (Harper, 1905), the organization of the resting nucleus is very characteristic. A deeply staining central body lies against the nuclear membrane and to this the c
RMRDYBXP–. The essentials of botany. Botany. Fig. 97. Fig. 96.—Crrape-mildew (Unoinula). a, a piece of a vegetative hypha, m, m, upon a fragment of the epidermis of the leaf of the grape, and to which it Is fastened by the suckers, U j 6, hypha, with the suckers, ft. seen in side view. Magnified 370 times. Fig. 97.—Grass-mildew (Erysiphe communis), cs, vegetative filaments, with a few suckers; ft, branches bearing conidia; c, separated conidia. Magnified 135 times. those of Ooleochaete, the difference being such as may be accounted for by taking into consideration the aquatic. Please note that these im
RMREF8D8–. Comparative morphology of Fungi. Fungi. Fiq. 124.—Sphaerotheca Humuli. Development of perithecia. 1. Young antheridium and ascogonium. 2. The antheridium divided into antheridial cell and stalk cell. 3. Plasmogamy. 4 to 6. Development of fertilized ascogonium. ( X 500; after Harper, 1896.) ascogonium while the other remains behind in the antheridium and degenerates. In a second group, as in Erysiphe Polygoni (E. Martii) on Pisum sativum and Ranunculus acris, E. cichoracearum on Sonchus oler- aceus, Phyllactinia corylea on Corylus Avellana, in Uncinula Salicis on. Fig. 125.—Erysiphe Polygoni.
RMRDXRXX–. A manual of poisonous plants, chiefly of eastern North America, with brief notes on economic and medicinal plants, and numerous illustrations. Poisonous plants. Fig. 92. Powdery Mildew. Sphaerotheca Castagnei. 1. Oogonium .(o) and anther* idium (o). 2. Separation of antheridium cell. 3. Fertilization and formation of addi- tional cells. 5-8. Further development of cells. All greatly magnified. After Harper.. Fig. 93. Powdery Mildew of Grass (.Erysiphe graminis). A. Oidium stage and mycelium m. B. Perithecium witti appendages and mycelium m. C. Perithecium with asci and ascospores. After Fran
RMREF8DH–. Comparative morphology of Fungi. Fungi. Fiq. 124.—Sphaerotheca Humuli. Development of perithecia. 1. Young antheridium and ascogonium. 2. The antheridium divided into antheridial cell and stalk cell. 3. Plasmogamy. 4 to 6. Development of fertilized ascogonium. ( X 500; after Harper, 1896.) ascogonium while the other remains behind in the antheridium and degenerates. In a second group, as in Erysiphe Polygoni (E. Martii) on Pisum sativum and Ranunculus acris, E. cichoracearum on Sonchus oler- aceus, Phyllactinia corylea on Corylus Avellana, in Uncinula Salicis on. Please note that these image
RMRGWKE4–. Bulletin. Natural history; Natural history. Figure 4. Erysiphe chicoracearum, DC. A ruptured perithecium with thread-like appendages and protrud- ing asci, eacli containing two spores, — magnified 90 times. ^. Fig. 5. Figure 5. Uncinula am- pelopsidis, Peck: a, perithe- cium with the numerous appendages (6) coiled at the tip,— magnified 100 times; c, one of the appendages (tip) further magnified; d,anas- cus with five spores,—magni- fied 200 times. The lower, pointed end of the ascus is attached to the bottom of the cavity of the perithecium.. Please note that these images are extracted from
RMREN467–. Insects affecting vegetables [microform]. Légumes; Vegetables; Insect pests; Insectes nuisibles. % 48 to apply it on a small scale to plants set apart for seed production, since healthy pods brar healthy seeds and healthy seeds will produce a clean crop the following year. FuwDBRv Mildew {Erysiphe polygoni). This usually appears Icte in the season. The fungus is of superficial habit, and forms a whitish or grayish coating which mav occur on any part of the plant above ground. Later, minute black fruiting bodies arc to be found scattered over the mildewed surface. Treatment: Since the fungus
RMRGGNMX–. Bulletin of the Illinois State Laboratory of Natural History. Natural history -- Illinois. FiGUEE 4. Erysiphe chicoracearum, DC. A ruptured perithecium with thread-like appendages and protrud- ing asci, each containing two spores, — magnified 90 times. n i^lk ^t4.l*' Figure 5. Uncinula am- pelopsidis, Peck: a, perithe- cium with the numerous appendages (6) coiled at the tip,— magnified 100 times; c, ^^^ one of the appendages (tip) further magnified; d,anas- cus with five spores,—magni- fied 200 times. The lower, pointed end of the ascus is attached to the bottom of the cavity of the perithe
RMREK8R6–. The classification of lower organisms. Biology. 132] The Classification of Lower Organisms. Fig. 25.—Ascomycetes: a-e, Dipodascus albidus after Juel (1902), x 1,000; a, gametes; b, syngamy; c, development of ascus; d, e, lower and upper parts of a mature ascus. f, Erysiphe graminis, haustorium penetrating an epidermal cell of a grass and conidiophore bearing a chain of conidia x 500. g-k, Cleistothecia of Perisporiacea x 100: g, of Erysiphe sp.; h, of Microsphaera sp.; i, of Podosphaera sp.; j, of Uncinula sp.; k, of Phyllactinia sp.. Please note that these images are extracted from scanned
RMRDE6N5–. The fungi which cause plant disease . Plant diseases; Fungi. Pig. 79.—Tip of ascus of Erysiphe showing delimitation of asco- Fig. 80.—Later stage than spore from asco- fig. 79, showing well de- plasm by astral fined spore-wall. After rays. After Harper. Harper. primary-ascus-nucleus. This by successive mitoses affords the single spore-nuclei. The spores are cut out from the protoplasm of the ascus in a most peculiar manner by reflexion of and union of astral rays which emanate from a centrosome-like organ at the beak of the prolonged nucleus. Figs. 79, 80. The significance of two nuclear fus
RMRDJH0K–. The essentials of botany. Botany. Fia. 78. Fis. 79. OS, apiece of a vesetative hypha, m, m, Upon a fragment of tte epidermis of the leaf of the grape, and to wliioh it is fas- tened by the suckers, A; o, hypha, with the suckers, h, seen in side view. Mag Pig. 78.- Grape-blight (Erysiphe). ': of thf nifled 370 times. Fia. 79.—Grrass-blight (Erysiphe communis), a, vegetative filaments, with a few suckers; 6, branches bearing conidia; c, separated conidia. Magnified 135 times. of the one and the aerial and parasitic or saprophytic habits of the other. 325. In the Blights, which are all parasiti
RMRE2EYH–. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. 'f-B Fig. s.—^Free cell formation of spores in the ascus of Erysiphe communis. A, ascus with single nucleus; C, cytoplasm; N, nucleus; NL, nucleolus; 5, successive stages in nuclear division within the ascus; at X, early anaphase, nuclear membrane, NM, still persisting: -Ri kinoplasmic radiations from the poles; at Y, telophase, new nuclear membrane not yet formed; Z, a later stage where the nuclear membranes demark the daughter nuclei; C, A, B and C, axe successiv
RMRDWBTK–. The essentials of botany. Botany. Fto. 78. Fie. 79. Fio. 7S.- Qrape-blight (Erysiphe). a, a piece of a vesetative. hjrpha, m, m, t of the â ' â " " 1 nified 370 times. upoa a fragment of tlie epidermis of the leaf of the grape, and to which it is fas-' tened by the suckers, ft; o, hjrpha, with the sueirers, h, seen in side view. Mag Fig. 79.âGrass-blight (Erysiphe communis), o, vegetative filaments, with a few suckers; &, branches bearing conidia; c, separated coiiidia. Magnified 135 times. of the one and the aerial and parasitic or saprophytic habits of the other. 325. In the
RMREF955–. Comparative morphology of Fungi. Fungi. 132 COMPARATIVE MORPHOLOGY OF FUNGI. Fig. 81.—Phyllactinia corylea. 1. Young ascus with dicaryon. 2 to 4. Caryogamy. 5. Spireme. 6 to 9. Steps in division of primary ascus nucleus. Erysiphe cichoracearum. 10 to 12. Spore formation. 13. Immature ascus. (1 to 5 X 1,500; 6, 13 X 1,000; 7 to 12 X 670; after Harper, 1905.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Gäumann, Ernst A
RMREF8FP–. Comparative morphology of Fungi. Fungi. Fig. 121.—1. Uncinula Salicis on Salix discolor. Haustoria which have penetrated the hypodermal cell layers. 2. Phyllactinia corylea on Cornuss tolonifera. Hyphal branch penetrating the mesophyll. 3. Erysiphe graminis on Poa pratensis. Haustoria. (1, 2 X 600; 3 X 1,200; after G. Smith, 1900.) the cuticle and the cell wall into the interior of the epidermal cell (Fig. 120, 2 to 4) and expands there into a saccate haustorium (Fig. 120, 5 and 6). This simple tuberiform or saccate knot is the usual type of haustorium in this group. Only in Erysiphe gramini
RMRE0KBN–. Studies on the plant cell. pt.1-8. Plant cells and tissues. ' - -^ â / H â¢'â¢s x:^ â ''??. Fig. 5.â Metapliases of Mito'sis. «, Saprolegnia; intranuclear spindle in oogonium, nucle- olus outside of spindle. ^, Erysiphe ; mitosis in ascus, asters with rather small centro- spheres. c, Corallina; first mitosis in tetraspore mother-cell, very large and well differentiated centrospheres. rf, Zamia; blunt poled intranuclear spindle in central cell of pollen grain ; blepharoplasts, their outer membrane about to break up. c, Pellia; first mitosis in spore mother-cell; broad spindle with rounded po
RMREGGR2–. Dr. L. Rabenhorst's Kryptogamen-Flora von Deutschland, Oesterreich und der Schweiz. Cryptogams -- Germany; Cryptogams -- Austria; Cryptogams -- Switzerland. Cicinnobolus 481 (Der ISTame kommt von cicinnus = Locke, Haarlocke, und ßoXog = "Wurf, Fang). Die hierher gehörigen Arten scheinen die Spermogonienformen von Erysiphe-Arten zu sein, was aber von mehreren Seiten nicht zugegeben wird. Cicinnobolus Cesatii De Bary a. Fruchtgehäuse. b. Sporen. c. Oidium erysiphoides. (Alles stark vergrössert.) Nach Tulasne.. 1424. C. Cesatii De Bary, Morphol. et Physiol. der Pilze, p. 71. Sacc, Syll. II
RMRGTN3P–. Bulletin. Natural history; Natural history. Article VI.— Parasitic Fungi of Illinois. J. BuRRiLL and F. S. Earle.. ,^. Y.W . By T. .^!i2^ ERYSIPHE^, Lev. (Ann. Sci. Nat., Ser. III., Tome XV.) Cn liirinnr nlcmfa IvTvPolinni anrvorfioiol onnciefi n<TP rti ERRATA. Page 389, line 7 from bottom, for carpogonium read sporo- carp; lines 9, 12, 15, for oogonium read carpogonium. Page 391, line 1, for Cessatii read Cesatii. Page 400, line 4, for Myceliumin conspicuous read Myce- lium inconspicuous; line 14, for coleosporium read Coleosjjoriiwi. Page 401, line 9, for connatus read connata; line 12
RMRHA2BY–. Botanische Zeitung. Plants; Plants. 9. Jahrgang*. Pen 19. pecetnber 1851. 51. Stück, Mnhliltt Origf.: Röper z. Flora Deutschlands. — Regel Bemerk, ül/. einige Pfl. d. bot. Gartens in Zürich. — Regel Bemerk, üb. einige Gisniriaceen. — liit.: Blume Museum Lugd. - ßalavum. No. 12 — 15. — Rcndiconlo delle sessiuni dell* Acad. delle scienze d. Belogna 1811 — 1817. — Samml.: C. Sprengel's. — M.. JVpt. : Oidiuin u. Erysiphe. — Berichtigung.— Anzeige.: Saamcn v. Victoria regia z. Tausch. — 889 — - S90 - Zur Flora Deutschlands. Von Joh. Röper, Prof. d. Botanik in Rostock. 1. Sclerochloa procumbens Pa
RMRD9TMY–. Einführung in die Biologie. Biology. Fig. 65. a Erysiphe auf Lithospermuin arvense, b Faden von Peronospora parasitica im Stengelmarli des Hirtentäschel. 150/1. Das trifft z. B. für die mit den Rostpilzen verwandten Brandpilze (Ustilagineen) zu, die vor allem in Gräsern zuerst zwischen den Zellen leben und erst als sporenbildendes Gefäde die Zellen des Wirtes aus- füllen; die Sporen sind kugelig, schwärzlich gefärbt und bilden ein stäubendes Pulver. Die häufigste Einwi rkung des Schmarotzerpilzes auf das befallene lebende Gewebe ist die, daß die Plasmakörper der ausgebeuteten Zellen infolge
RMRN2HHH–. Annales de la science agronomique franaise et trangre. Agriculture; Art -- France; Agriculture experiment stations -- France. % ^^ {610) Ciooj :/ fyao) FiG. 8. — Pe!Jîci72J«i)j jria«CM»i LiNK (d'après Brefkld). 1. Sommet d'un filament ascophore. Fragment d'un filament en fi-nctitication dont les bi-auches latérales ascophores sont mûres et en partie tombées. — 3. Ascospores vaa de côté ; h et c, germination. qui, d'après lui, ne proviennent pas d'un seul, mais de plusieurs organes initiaux. Erysiphe (Oïdium). Les Erysiphe s'installent d'ordinaire sur les plantes vivantes et y forment le tapi
RMRH96F7–. Botany : current literature. Botany; Bibliography. Library, Bureau of Plant Industry Current Author Entries, 1924, Ho. 133. Indexed Apr,7, 1924 -Apr. 19, 1924,. Agric. Colon. Bruno, Erancesco &. Sorges, Felice. Ancora sulla utilizzazione industrials dell' Andrcpogcn citratus DC Agric. Colon. 18: 81- 85. Mi'. 1924. no. 3. Agron. Colon. Ammann, Paul. L'utilisation des bois de la foret de la Ccte d'lvoire en papeterie. Le parasolier. Agron. Colon. 10: 33-41. p. 1924. no. 74. Amer. Bot, Claassen, Edo. Abundance of Erysiphe. Amer.Bot. 30: 79. Ap. 1924. no,2. Claassen, Edo. Oil-glands of the l
RMRN2HGH–. Annales de la science agronomique franaise et trangre. Agriculture; Art -- France; Agriculture experiment stations -- France. % ^^ {610) Ciooj :/ fyao) FiG. 8. — Pe!Jîci72J«i)j jria«CM»i LiNK (d'après Brefkld). 1. Sommet d'un filament ascophore. Fragment d'un filament en fi-nctitication dont les bi-auches latérales ascophores sont mûres et en partie tombées. — 3. Ascospores vaa de côté ; h et c, germination. qui, d'après lui, ne proviennent pas d'un seul, mais de plusieurs organes initiaux. Erysiphe (Oïdium). Les Erysiphe s'installent d'ordinaire sur les plantes vivantes et y forment le tapi
RMRMW6NB–. Annales des Sciences Naturelles Botaniques. 384 TABLE DES ARTICLES CONTENUS DANS CE VOLUME. 9. 28, C. coma ta. 24, C. Mougeotii. 25, C. Grossulariœ. 26 , C. Dubyi. 27, C. holoserkea. 4 0. 28, C. Berberidis. 29, Erysiphe Linkii. 30, E. taurica, 34 , E. lampro- carpa. 32, E. Duriœi. 33, E. graminis. 34. £". Martii. 44, 35, E. tortilis. 36, /?. Montagnei. 37, £. horridula. 38, E. communis. 4 2. I, Marumia muscosa. II, Bredia Ursula. III. Medinilla rose a. W. M. java- nensis. 4 3. I, Medinilla rubicunda. II, il/, loranthoides. III, Diplogenea viscoidea. 4 4. Erpelina radieans. 4 5. I, Pogon
RMRCC6GN–. Diseases of economic plants. Plant diseases. VEGETABLE AND FIELD CROPH 221 Powdery mildew (Erysiphe polijgoni DC.)- —This mildew of the cucumber and cantaloupe in general appearance resembles that described for the grape. It is more com- mon under glass than in the open, and here indicates too much moisture and too little ven- tilation. It is sel- dom injurious in the field. Flowers of sul- phur applied to the hot water or steam pipes in the form of a paste is useful. Leaf blight, cer- cosporose {Cercos- pora CucurbitcB Ell. &Ev.). —The spots of this disease are much like those of altern
RMRCDPHW–. Diseases of economic plants. Plant diseases. VEGETABLE AND FIELD CROPS 221 Powdery mildew (Erysiphe polygoni DC).— This mildew of the cucumber and cantaloupe in general appearance resembles that described for the grape. It is more com- mon under glass than in the open, and here indicates too much moisture and too little ven- tilation. It is sel- dom injurious in the field. Flowers of sul- phur applied to the hot water or steam pipes in the form of a paste is useful. Leaf blight, cer- cosporose (Cercos- pora Cucurbitce Ell. &Ev.). — The spots of this disease are much like those of alterna
RMRCD6DC–. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. PODOSPHAERA. 175 P. myrtillina Schub. ou leaves of Vacdnium MyrfiUus (bil- berry), V. aligiiiosum, and J^nipctrmn nigrum (crowberry), (U.S. America). Erysiphe. The perithecia contain several asci, each with two to eight oval hyaline spores. The appendages are like these of Sphae- rotluca, simple and thread-like. Erysiphe graminis D. C. Mould or mildew of grass and wheat, (xrass and cereals, especially wheat, often suf
RMRCDPD6–. Diseases of economic plants. Plant diseases. CEREALS 375 Anthracnose (Colletotrichum cereale Manns). — This an- thracnose seems to prevail on wheat as extensively as upon rye. Upon wheat the head or parts of it are not destroyed, as in the case of rye, but general weakness of the plant and light shriveled grain follows the attack. Powdery mildew (Erysiphe graminis DC). — The usual characters of the powdery mildews are exhibited: a whitish,. Fig. 160. — Normal wheat kernels and shriveled kernels due to anthracnose. After Manns. flour-like coating in irregular circular spots upon the leaves an
RMRCD9MC–. Diseases of crop-plants in the Lesser Antilles. Tropical plants; Plant diseases. DISEASES CAUSED BY FUNGI 37 proper (Euascomycetes) contain an enormous number of species, a fair number of which are plant parasites. The Erysiphaceae or powdery mildews (see p 20) and the. W'^. Fig. 8 ASCOMYCETES 1. Peziza. 2. Balansia trinitensis. 3. Scleroderris. 4. Perithecia and Conidia of an Erysiphe. 5. Nectria 6. Xylaria. 7. Hypoxylon. 8. Pseudovalsa. From Engler & Prantl. Nat. Pflanz. Perisporiacese (which include the fungi of "black blight") have mycelium which is superficial on the host
RMRCC6D5–. Diseases of economic plants. Plant diseases. CEREALS 375 Anthracnose {Colletotrichum cereale Manns). — This an- thracnose seems to prevail on wheat as extensively as upon rye. Upon wheat the head or parts of it are not destroyed, as in the case of rye, but general weakness of the plant and light shriveled grain follows the attack. Powdery mildew {Erysiphe graminis DC). — The usual characters of the powdery mildews are exhibited: a whitish,. Fig. 160. — Normal wheat kernels and shriveled kernels due to anthracnose. After Manns. flour-like coating in irregular circular spots upon the leaves an
RMRCDA22–. Diseases of cereal and forage crops in the United States in 1922. Grain Diseases and pests United States; Forage plants Diseases and pests United States. 250 Pov/dery milde-.v caused by Erysiphe sp. Probably the most noteworthy plant outbreak of the year was that of powdery milde"/ of red clover. In 1^21 it appeared in unprecedented amounts in states in the nortlieastern quarter of the country, but during 1922 it v/as much more widely dis- tributed and occurred all over eastern United Jtates from South to North ard in eastern Canada. The accompanying m.ap shows the geographical range of
RMRCDP8H–. Diseases of field crops. Plant diseases. Diseases of Field Crops 25 Control measures for this disease lie in obtaining* clean seed. Plantings for seed production should be made in places well isolated from other bean fields and with seed from fields which are as free from mosaic as. Fig. 17.—Ehizoctonia stem rot of bean. (From Ext. Cir. 119.) possible. The seed field should then be carefully rogued by pulling out every plant which shows mosaic as soon as it can be detected. Powdery Mildew.—A gray mildew, Erysiphe polygoni, sometimes de-. Please note that these images are extracted from scann
RMRCDA1R–. Diseases of cereal and forage crops in the United States in 1921. Grain Diseases and pests United States; Forage plants Diseases and pests United States. OATS - Smuts 215 Powdery rrdldev/ caused by Erysiphe graminis DC. - reported to te very prevalent in Nev; York where, on account of the early warm spring, the damage reached 1.^%, according to Kirby; cird was reported once in Oregon, in a moist draw in a field at I'oro. Leaf spoi. cdused by Septoria passerinii Sacc . This has been reported from V.'isconsin. (V.'eber, George F. Studies on Septoria diseases of cereals and certain grasses. (Ab
RMRCDA10–. Diseases of cereal and forage crops in the United States in 1924. Grain Diseases and pests United States; Forage plants Diseases and pests United States. i8i Clover - Pov/dery nil-ew th^t the^t: is a C-)lisiierable iiffurence in susoeptib ilit:v^ between various str^dns, ind that the Italian strain is particularly sus- ceptible to t^iifi ..isoase." (A. J. Pieters) Re oent lite ra tu rc; . . â Cited: 1. SympoGiu.n - The fora-e problem. Jour. Ani?r. Soo. Agron. lo: 1^3-253. iM.ar. 1924. POVSERY MIIDEV; CAUSED BY ERYSIPHE POLYGON! DO. Powdery niliew was aTDparently as widespread as in the
RMRCXTKC–. Der gegenwrtige Standpunkt der Mycologie mit Rcksicht auf die Lehre von den Infections-Krankheiten. Pathogenic fungi. 109 weit dünnerp, zarte Fäden verlaufen, welche sich verzweigten und einzelne Aeste in die Conidienträger entsendeten. Wur- den Stücke solchen Myceliunis im Wasser liegen gelassen, sü wuchsen die dünneren Fäden aus denselben heraus, wodurch sie dann weit deutlicher sichtbar waren und iiire parasitische Natur unzweifelhaft erkennen Hessen. Die weitere Entwicklungsgeschichte dieses Schmarotzers verläuft in der Weise, dass die in die Conidienträger der Erysiphe gelangte
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