Fungicide resistance in the frogeye leaf spot of soybean pathogen – a case example.

1.0 PM CEU

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Frogeye leaf spot, caused by Cercospora sojina, is one of the most important foliar diseases of soybean in the U.S.  Historically, management of frogeye leaf spot was relatively easy with the application of foliar fungicides that contained active ingredients from the strobilurin class of fungicides.  Unfortunately in 2010, strains of C. sojina with high levels of resistance to strobilurin fungicides were observed for the first time in the U.S., and strobilurin fungicide-resistant strains of C. sojina can now be found in several states across the U.S.  In light of these strobilurin fungicide-resistant strains being present across the U.S., management of frogeye leaf spot has become more difficult, but is still achievable.