Abstract
Fungicide resistance has been an issue with managing powdery mildew of cucurbit crops since resistance was detected to MBC fungicides. This was the first chemical class with resistance risk registered for this use and one of the first cases of resistance in the USA. The pathogen has developed resistance or reduced sensitivity to fungicide chemical classes registered subsequently following a few years of commercial use, first with DMIs, then QoIs, and next SDHIs. Resistance has been associated with failure to control powdery mildew with FRAC codes 1, 3, 7, and 11 fungicides. FRAC 1 and 11 fungicides are still labeled for this use, but are not recommended due to suspected widespread occurrence of resistance. FRAC 3 fungicides usually are effective when applied at high label dose. FRAC 7 fungicides usually are effective as well. Cross-resistance within chemical classes is the norm except that fluopyram is dissimilar from other SDHIs tested. Quinoxyfen and cyflufenamid, which were registered for this use in 2007 and 2012, respectively, are currently considered the most effective fungicides for managing cucurbit powdery mildew. They are recommended for use in alternation also including FRAC 3 and 7 fungicides. With four targeted chemistries to alternate among, farmers can implement a good program for managing powdery mildew and fungicide resistance. Pathogen sensitivity to fungicides is being determined with bioassays using seedlings for field populations and leaf disks for isolates. Challenges that resistance can impose on effectively managing a disease have been illustrated with cucurbit powdery mildew, arguably the most important pathosystem of a vegetable crop plagued by resistance.
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McGrath, M.T. (2015). Cucurbit Powdery Mildew in the USA. In: Ishii, H., Hollomon, D. (eds) Fungicide Resistance in Plant Pathogens. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55642-8_25
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DOI: https://doi.org/10.1007/978-4-431-55642-8_25
Publisher Name: Springer, Tokyo
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