Diseases of wheat, oats, barley, Diseases of wheat, oats, barley, and rye diseasesofwheato48boew Year: 1960 BOEWE: DISEASES OF WHEAT, OATS, BARLEY, AND RYE 51 also, they may be found on the chaff and spikes of diseased heads. These tiny elevations are the spore-bearing bodies of the fungus that causes the disease. In severe infections the presence of anthracnose is made evident by a general reduction in vigor and plant development and by premature ripening or whitening of the infected plants. The blighting of heads that accompanies this disease is not asso- Fig. 15.—Anthracnose on wheat.
Diseases of wheat, oats, barley, Diseases of wheat, oats, barley, and rye diseasesofwheato48boew Year: 1960 BOEWE: DISEASES OF WHEAT, OATS, BARLEY, AND RYE 51 also, they may be found on the chaff and spikes of diseased heads. These tiny elevations are the spore-bearing bodies of the fungus that causes the disease. In severe infections the presence of anthracnose is made evident by a general reduction in vigor and plant development and by premature ripening or whitening of the infected plants. The blighting of heads that accompanies this disease is not asso- Fig. 15.—Anthracnose on wheat. Discoloration of stem joints is a characteristic of the diseaso, as is also the presence of black specks on stems, sheaths, and glumes. Severely infected plants ripen prematurely. ciated with a pink mold, as in the case of scab. Badly affected plants are greatly weakened; the result is shriveled grain, the amount of shriveling depending upon the severity of the attack. Life History.—The tiny black spots found on various parts of sick plants produce spores which are dispersed by wind and rain to healthy plants. It is thought that infection may occur on any part of a plant. The fungus is able to live as a parasite on living plants and as a saprophyte on dead plant material. It lives through the winter as spores or as mycelium on seed, straw, and stubble of grain, and on wild grasses. Quack grass is very susceptible and is a fruitful source of spores for new infection. Seed-borne infection is thought to be one source of root rot and crown rot. .yjlVERSIlY OF ILLINOIS
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