. Fig. 10.—Anthracnose on wheat. Discoloration of stem joints is a charac- teristic of the disease, as is also the presence of the black specks on stems, sheaths and glumes. Severely infected plants ripen prematurely and bear shriveled grain. on the leaf sheath and sometimes on the leaf, and may also be found on the chaff and spike of diseased heads, fig. 10. These tiny elevations are the spore-bearing bodies of the fungus that causes the disease. In severe infections the presence of the disease is made evident by premature ripening or whitening of the infected plants. The blighting of heads t
. Fig. 10.—Anthracnose on wheat. Discoloration of stem joints is a charac- teristic of the disease, as is also the presence of the black specks on stems, sheaths and glumes. Severely infected plants ripen prematurely and bear shriveled grain. on the leaf sheath and sometimes on the leaf, and may also be found on the chaff and spike of diseased heads, fig. 10. These tiny elevations are the spore-bearing bodies of the fungus that causes the disease. In severe infections the presence of the disease is made evident by premature ripening or whitening of the infected plants. The blighting of heads that accompanies it is not associ- ated with a pink mold as in the case of scab. Badly affected plants are greatly weakened, resulting in shriveled grain, the amount of shriveling depending upon the severity of the attack. Life History.—The tiny black spots, found on various parts of the sick plants, late in the season produce spores which are dispersed by wind and rain to healthy plants and to the grain. It is thought that infection may occur on any part of the plant. The fungus is carried through the winter as spores on the seed, as actual infection within the seed, and on infected straw, stubble
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Keywords: ., bookcentury1900, bookcolle, bookpublisherurbana, booksubjectgrain
