. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 613 conidia acrogenous, straight, cylindrical, ends rounded, 4 to 5- septate, not constricted, dark olive-brown, 100-115 x 14- 18 /*. On oats and barley. H. avense Ei. Similar to H. teres, but the conidiophores scattered, 150-200 x 9-12 n, septate, brown; conidia cylindric, brownish, 4 to 6-septate, 80-100 X 15-16 n. On oats. The conidia of the two last species infect grains and seedlings. The conidia spread the disease from the early infection centers to other parts of the plants but the myceliu
. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 613 conidia acrogenous, straight, cylindrical, ends rounded, 4 to 5- septate, not constricted, dark olive-brown, 100-115 x 14- 18 /*. On oats and barley. H. avense Ei. Similar to H. teres, but the conidiophores scattered, 150-200 x 9-12 n, septate, brown; conidia cylindric, brownish, 4 to 6-septate, 80-100 X 15-16 n. On oats. The conidia of the two last species infect grains and seedlings. The conidia spread the disease from the early infection centers to other parts of the plants but the mycelium remains local. H. bromi Died, on Bromus=Pleospora bromi, see p. 261. H. tritici-repentis tritici-repentis, see p. 262. H. sativum (P.) K. & B.'"^ Mycelium branched, septate; conidiophores fasciculate, fuscous, brown, septate, 8-10 ju wide, sometimes swollen between the septa; conidia solitary, apical, dark brown, 6 to 11-septate, 105- 130 X 15-20 UL. The cause of a destructive late blight of barley from Iowa to Saskatchewan. The disease manifests itself by dark colored, elongate spots on the leaves. It also occurs on the glumes and spikelets, sometimes even penetrating the grains. H. sorokinianum Sacc. is re- ported on wheat and rye in Russia; H. tritici Hen. on w^heat in Africa; H. sigmoideum Cav. on rice in Italy; while several species are recorded on bam- boo. H. turcinum Pass. Spots, large, dry, brownish; conidiophores, gregarious to fascicu- late, septate, 150-180 X 6-9 II, pale olive, apex almost hyaline, often nodulose; conidia spindle-shaped, acute, 5 to 8-septate, pale olive, 80-140 x 20-26 li. It produces spots on com and sorghum in Europe and America. H. inconspicuum C. & E.^^- ^^^. Fig. 413.—Helminthosporium sativum from barley, spores and conidiophores. After Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrat
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
