9/8/2023 0 Comments Potato fungicides![]() ![]() For a list of plant pathogens where isolates resistant to QoIs were found see Species with QoI Resistance (Status Dec. They were found to have a mutation in the cytochrome b gene that caused the protein to change from Gly to Ala at position 143 (G143A). 2000) resistant to QoIs were found a short time later. 2000) and Plasmopara viticola (Heaney et al. The first members of the QoIs were launched in 1996. ![]() As each member of the group has its particular strengths, label recommendations for specific products should always be followed. ![]() Most of the members of the class are registered broadly on a large number of crops although a few members are registered for use on a narrower spectrum of crops and diseases. The QoIs are active against a broad range of plant pathogens including representatives of all three important genera of plant pathogens, the ascomycetes, basidiomycetes and oomycetes. The members of the Qo group (FRAC group 11) are cross-resistant with each other but are not cross-resistant with members of the QiI (FRAC group 21) or QoSI (FRAC group 45). There are two other fungicidal target sites at complex III, the Quionone " inside" (Qi) site (FRAC group 21) and the Quinone " outside" Stigmatellin binding (QoS) sub site (FRAC group 45). They do this by blocking the transfer of electrons at the Quinone " outside" site of the bc1 complex (complex III in the electron transport chain). The Qo fungicides inhibit plant pathogens by blocking the pathogens ability to produce energy. Fungicides in the code group 11A are not cross resistant to fungicides in the FRAC code group 11 based on the G143A mutation. QoI FRAC code 11A fungicide is: metyltetraprole.įungicides within each code group are all cross-resistance to each other and should be managed accordingly. The QoI FRAC code 11 fungicides are: azoxystrobin, coumoxystrobin, dimoxystrobin,enoxastrobin, famoxadone, fenamidone, fenaminostrobin, fluoxastrobin, flufenoxystrobin, kresoxim-methyl, mandestrobin, metominostrobin, orysastrobin, pyraoxystrobin, picoxystrobin, pyraclostrobin, pyrametostrobin, pyribencarb, triclopyricarb, trifloxystrobin. The Qo inhibitor fungicides (QoI) are separated into two subgroups reflecting different binding properties (FRAC codes 11 and 11A). Go directly to FRAC-Recommendations for Resistance Management for QoI Fungicides. The Qo inhibitor fungicides all act at the Quinone ‘outer’ (Qo) binding site of the cytochrome bc1 complex. The working group is responsible for global fungicide resistance strategies in the Qo inhibitor fungicides (QoI). ![]()
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