Diseases of wheat, oats, barley, Diseases of wheat, oats, barley, and rye diseasesofwheato48boew Year: 1960 BOEWE: DISEASES OF WHEAT, OATS, BARLEY, AND RYE 79 been much more destructive of oats since 1938 than in the period 1922-1937. In an average recent year 9 per cent of the oat heads and per cent of the spikelets are infected. The percentage of plants that are infected is usually low and there are usually not more than two diseased spikelets per head. However, 46 per cent of the plants and 3 per cent of the spikelets have been found infected in a field. In 1958, the worst scab year i
Diseases of wheat, oats, barley, Diseases of wheat, oats, barley, and rye diseasesofwheato48boew Year: 1960 BOEWE: DISEASES OF WHEAT, OATS, BARLEY, AND RYE 79 been much more destructive of oats since 1938 than in the period 1922-1937. In an average recent year 9 per cent of the oat heads and per cent of the spikelets are infected. The percentage of plants that are infected is usually low and there are usually not more than two diseased spikelets per head. However, 46 per cent of the plants and 3 per cent of the spikelets have been found infected in a field. In 1958, the worst scab year in Illinois, according to Natural History Survey records, 19 per cent of the heads and slightly Fig. 26.—Scab on oats. The white spikelets shown above are diseased; the darker ones are healthy.
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