So far this spring, we have received considerable precipitation. Frequent rainfalls in spring are favorable for the development of foliar diseases on alfalfa. It is time to check for these diseases, especially if more rain occurs over the next 2 weeks. Knowing the level of alfalfa disease in early May helps in making management decisions. High levels of foliar diseases in May can cause early defoliation before the first cutting. Poor growth in spring due to disease problems also may affect alfalfa growth in summer and fall.
Iowa State University
Yang, X. B., "Scouting alfalfa diseases in spring" (2003). Integrated Crop Management News. 1614.
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