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Adding microencapsulated pear ester to insecticides for control of Cydia pomonella (Lepidoptera: Tortricidae) in apple

Authors


Alan L Knight, USDA—ARS, 5230 Konnowac Pass Rd, Wapato, WA 98951, USA. E-mail: alan.knight@ars.usda.gov

Abstract

BACKGROUND: The possibility of improving the efficacy of various insecticides for codling moth, Cydia pomonella (L.), by the addition of a microencapsulated formulation of pear ester, ethyl (2E, 4Z)-2,4-decadienoate (PE-MEC, 5% AI), was evaluated in field trials in apple from 2005 to 2009.

RESULTS: The addition of PE-MEC (<3.0 g AI ha−1) significantly lowered fruit injury with low rates of organophosphate and neonicotinoid insecticides. The addition of PE-MEC (1.48 g AI ha−1) to maximum label rates of insecticides with moderate activity for codling moth, such as ebamectin benzoate, spinosad and methoxyfenozide, significantly improved their effectiveness. However, PE-MEC did not consistently improve the activity of maximum label rates of either rynaxypyr or spinetoram. The addition of PE-MEC with seasonal spray programs of acetamiprid and azinphos-methyl in combination with the use of sex pheromones for mating disruption provided the most effective control.

CONCLUSION: The addition of PE-MEC can improve the effectiveness of some insecticides for codling moth in apple. Insecticides active via dermal toxicity are more strongly improved by the addition of PE-MEC. Season-long use of PE-MEC can also augment the effectiveness of mating disruption. Adding PE-MEC to variable integrated management programs for C. pomonella should be further investigated. Published 2012 by John Wiley & Sons, Ltd.

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