It is time to check for diseases in first crop alfalfa because cool temperatures and frequent spring rains are favorable for the development leaf diseases in Iowa alfalfa. Knowing the level of leaf diseases in early May can help in making management decisions. Severe diseases can cause early defoliation, so scouts should watch for the following diseases that occur in spring.
Iowa State University
Yang, X. B. and Munkvold, Gary P., "Spring alfalfa diseases in 2002" (2002). Integrated Crop Management News. 1701.
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