Management of Organophosphate Resistant Codling Moth
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1 Management of Organophosphate Resistant Codling Moth In the Field John E. Dunley Washington State University Tree Fruit Research and Extension Center Wenatchee, WA
2 Background Codling moth has increased as a problem in the past several years Possible explanations for problems Evolution of resistance to mating disruption no Evolution of resistance to Guthion maybe Inadequate control tactics? hmmmm New materials are available Assail, Calypso, Diamond, Avaunt More expensive More applications
3 Summary of Resistance Ratios Chlropyrifos Methyl Parathion DDT Esfenvalerate Fenpropathrin Fenoxycarb Resistance in CM Crossresistance with OP- resistance is very broad X-R possible with just about everything Resistant 1 Resistant 2 ns LC5 0 Susc. / LC5 0 Resist LC5 0 Resist / LC5 0 Susc. Diazinon Azinphosmethyl Carbaryl
4 Guthion bioassays Statewide survey Washington 2003 First generation Susceptible generally around 0.6 to 0.1 µg / moth Moderate resistance to 0.3 µg / moth High resistance > 0.4 µg / moth Variable in resistance Low to moderate Mod. R LC50 (mg/moth) Susc. 0 Prosser Grandview S. Wapato Wapato N. Wapato Yakima Quincy WSU-TFREC East Wenatchee Peshastin
5 First Generation Resistance Ratios Some variation But no significant differences 3.5 Mod. R 3 Susc Resistance Ratio Peshastin East Wenatchee WSU-TFREC Quincy Yakima N. Wapato Wapato S. Wapato Grandview Prosser
6 High R Mod. R Susc. Manson-2 Manson-1 Peshastin East Wenatchee Guthion bioassays Second generation More variation Location with high resistance LC50 (mg/moth) WSU-TFREC Quincy N. Wapato Wapato-2 Wapato-1 S. Wapato Grandview Prosser
7 Second Generation Resistance Ratios Guthion resistance mostly low levels Codling moth resistance low to moderate But one location was significantly high High R Resistance Ratio Mod. R Susc. 0 Manson-2 Manson-1 Peshastin East Wenatchee WSU-TFREC Quincy N. Wapato Wapato-2 Wapato-1 S. Wapato Grandview Prosser
8 Lorsban bioassays Limited information for Lorsban Negative cross-resistance may be there Not statistically significant, however Location LC50 (µg ai / moth) Resistance Ratio Prosser Grandview WSU-TFREC
9 Asana bioassays Limited information for Asana No differences Location LC50 (µg ai / moth) Resistance Ratio Prosser Grandview WSU-TFREC
10 Assail bioassays Assail results not statistically robust Cross-resistance appears likely, though Location Prosser Grandview Manson-2 WSU-TFREC Manson-1 LC50 (µg ai / moth) Resistance Ratio na estimates probit lines are not statistically significant
11 Conclusions about resistance Pressure related performance Increased resistance / tolerance led to decreased Guthion performance Reduce management tactics compounded problems High pressure led to reduced performance Portion attributable to Guthion resistance
12 Codling moth resistance Worry about OP resistance in CM High levels rare Many areas have low to moderate levels Worry about crossresistance Guthion resistance gives some level of resistance to almost everything Resistance Ratio Assail / Calypso? Prosser Grandview S. Wapato Wapato-1 Wapato-2 N. Wapato Quincy WSU-TFREC East Wenatchee Peshastin Manson-1 Manson-2
13 Bioassays in 2004 In OP-Resistant apple orchard Location Guthion Assail Asana Lorsban LC50 (µg ai / moth) Resistance Ratio
14 2004 Field Trials In OP-R orchard Large plots Standard and new season long programs Each generation assessed separately Same program on each experimental unit for 1 st and 2 nd generation
15 Field trials in % damage In OP-Resistant population in apple Tmt 1 st gen 2 nd gen Calypso 6 oz (2 covers / gen) Assail 3.4 oz (2 covers / gen) Guthion 3 lb (2 covers / gen) Diamond 40 oz, Assail 3.4 oz (1 combination cover / gen) Success 6 oz (2 apps 1 st gen, 3 apps 2 nd) Lorsban 2 lb (2 covers / gen) Asana 14.5 oz (2 covers / gen)
16 Conclusions All of the programs were effective OP resistance can be managed Cross-resistance with neonicotinyls is likely But it doesn t appear to affect field performance at field rates
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