The Phytophthora fungi undergo changes when production practices are used against them for a long time. These changes can sometimes make current control measures ineffective. Recently, there are two types of changes to be aware of in Phytophthora: 1) effectiveness of fungicide treatments, and 2) race shift, which often is followed by producers asking, What new races occur in my soybean fields? This article addresses these issues.
Iowa State University
Yang, X. B., "Fungicide resistance and race test for Phytopththora" (2002). Integrated Crop Management News. 1811.
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