Early May is the time to check for alfalfa diseases. When spring has cool temperatures and frequent rains, the weather will promote the development of leaf diseases in some alfalfa fields. Knowing the occurrence of alfalfa diseases in early May helps make decisions about the first cutting. High levels of alfalfa foliar diseases such as spring back stem can cause early defoliation before you make the first cut, resulting in yield reduction.
Iowa State University
Yang, Xiao-Bing, "Spring is Time to Check Alfalfa for Foliar Diseases" (2009). Integrated Crop Management News. 655.
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