Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 USTILAGO. 285 very frequently on Avena sativa, also on Avena orientalis, A. fatua, and A. strigosa in Europe and Xorth America. So common is it that one seldom sees a field of oats free from the black smutted ears (Fig. 156). All parts of the flower are attacked, the ovary, stamens, glumes, and even the awns. The grains become filled with the black spore-powder, which shows through the transparent
Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 USTILAGO. 285 very frequently on Avena sativa, also on Avena orientalis, A. fatua, and A. strigosa in Europe and Xorth America. So common is it that one seldom sees a field of oats free from the black smutted ears (Fig. 156). All parts of the flower are attacked, the ovary, stamens, glumes, and even the awns. The grains become filled with the black spore-powder, which shows through the transparent Fig. \b6.~Ustilago avenae. The Oat-smut on Avena sativa. (v. Tubeuf phot.) membrane of the ovary wall. The diseased ears emerge from their enclosing leaf-sheaths, and become exposed to wind and rain, under the effects of which the delicate membrane soon becomes ruptured and the spores are blown or washed away, till only the axes of the spikelet are left with a few ragged remains of the flower. As a rule every shoot of a plant and all the grains of an ear are attacked; if single grains do escape, they remain poorly developed. The spores (5-8) have a smooth or slightly granular coat, and
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