Inheritance of resistance to carboxylic acid amide (CAA) fungicides in Plasmopara viticola
作者： U. Gisi , M. Waldner , N. Kraus , P. H. Dubuis , H. Sierotzki
DOI: 10.1111/J.1365-3059.2006.01512.X
关键词:
摘要: Mandipropamid is a new mandelic acid amide fungicide expressing high activity against foliar infecting oomycetes, including the grapevine downy mildew, Plasmopara viticola. Because cross-resistance with valinamide fungicides iprovalicarb and benthiavalicarb cinnamic dimethomorph flumorph was postulated, all five compounds are classified as carboxylic (CAA) fungicides. To support this classification, among these field isolates segregation of resistance in F1 F2 progeny P. viticola were evaluated. A bimodal distribution sensitivity CAAs for vast majority detected. Crosses between sensitive (s) CAA-resistant (r) opposite mating types, P1 P2, yielded abundant oospores. All F1-progeny to (s:r 1:0), whereas about 9:1 (s:r) observed suggesting that CAA controlled by two recessive nuclear genes. Mating type segregated ratio P1:P2 c. 2:1 1:1 progeny. In same crosses, phenylamide mefenoxam 1:3:2 (sensitive:intermediate:resistant), reflecting monogenic, semidominant nature resistance. The risk moderate This first report on inheritance phenotypic traits
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