Diseases of cereal and forage Diseases of cereal and forage crops in the United States in 1920 diseasesofcereal15from Year: 1921 129 states stem rust v;as undoubtedly rmst important contributing factor, while a combination of stem rust and scab were chiefly responsible in South Dakota. The percentages of shrinkage in spring wheat for t:ie principal spring wheat states in the Mississippi Vallsy section are as follows: 4 • Wisconsin. 3 North I7 Michigan 25 South 3 Iowa 28 Nebraska 43 28 Pig. 24. Estimated percentage reduction in yield
Diseases of cereal and forage Diseases of cereal and forage crops in the United States in 1920 diseasesofcereal15from Year: 1921 129 states stem rust v;as undoubtedly rmst important contributing factor, while a combination of stem rust and scab were chiefly responsible in South Dakota. The percentages of shrinkage in spring wheat for t:ie principal spring wheat states in the Mississippi Vallsy section are as follows: 4 • Wisconsin. 3 North I7 Michigan 25 South 3 Iowa 28 Nebraska 43 28 Pig. 24. Estimated percentage reduction in yield from stem rust of ATheat, 1920. Comments of especial interest on occurrence and severity of infection are as follows: Michigan: 'Stem rust probably reduced winter wheat by the average amount j which, with leaf rust, has generally been believed to be under 5* Frequent cases were found in the lower tier of counties where severe loss was associated with barberry plants in close proximity to fields. In the spring wheat area, which is largely in the Upper Peninsula, loss from black stem rust was worst in years, wheat in I general being shriveled and of poor quality. At the Chatham sta- tion spring wheat was not harvested. A ivrip through that section showed any number of fields that locked prcnouncedly scoty from a distance. I would place the loss at easily 25 in spring wheat. li
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