. Diseases of small grain crops in Illinois. Grain. 86 ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 35 Upon aging, their color fades from dark brown to brownish gray, because of spores formed by the net blotch fungus. From these spores, new infections arise on other leaves, other plants and finally on the grain. Some of the spots are blotchlike and have. Fig. 32.—Net blotch of barley. The outstanding characteristic of net blotch is a netted appearance in the spots, due to uneven distribution of brown color. yellow edges, and the leaf tissue surrounding them is often some- what yellowish. Streaks c
. Diseases of small grain crops in Illinois. Grain. 86 ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 35 Upon aging, their color fades from dark brown to brownish gray, because of spores formed by the net blotch fungus. From these spores, new infections arise on other leaves, other plants and finally on the grain. Some of the spots are blotchlike and have. Fig. 32.—Net blotch of barley. The outstanding characteristic of net blotch is a netted appearance in the spots, due to uneven distribution of brown color. yellow edges, and the leaf tissue surrounding them is often some- what yellowish. Streaks caused by this disease can be distin- guished from those of the stripe disease, since the former are much shorter and the leaf tissue does not split or shred along them. At harvest the straw of diseased plants is dull brown and weak. Infected kernels bear dark spots at the base. Life History.—The net blotch fungus produces both winter and summer spores. The summer spores are borne in abundance on the surface of leaf spots, where they may be seen as a grayish powder. Scattered by wind, water and other means, they infect leaves and plants. Successive crops of spores are formed during the growing season. Those spores falling upon the chaff may germinate and infect the grain. Once the fungus gets into the hull, it remains dormant throughout the season but renews its growth when the seed is sown. This results in direct infection of the seedling and the formation of spots on seedling leaves. The winter spores are produced in very small, dark, 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 Boewe, Gideon Herman, 1895-. Urbana
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Keywords: ., bookcentury1900, bookcolle, bookpublisherurbana, booksubjectgrain
