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Evaluation of Pheromone Disruption in Combination with Insecticide Applications for Control of Peachtree Borers 2001

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Project Leader(s): A. Agnello and D. Kain, Dept. of Entomology, NYSAES, Geneva, NY 14456

Type of grant: Pheromones; biorationals; microbials; conventional pesticides

Project location(s): Research location: Wayne Co. (Sodus and Williamson, NY)

Applicability: All of NY

Abstract: The effectiveness of three different treatments were compared in the control of infestations and damage by peachtree borer (PTB) and lesser peachtree borer (LPTB) in commercial peach orchards: (1) pheromone disruption dispensers combined with directed trunk insecticide applications; (2) pheromone disruption dispensers only; (3) directed trunk insecticide applications only. Pheromone dispensers were placed in blocks (2—3 acres) of peaches on two farms in Wayne Co., and insecticide treatments were applied to single-tree plots in each block. These insecticide sprays were also applied to comparable trees in another planting at each farm not containing the pheromone dispensers. The effectiveness of the different treatments was evaluated by comparing adult male trap catches in pheromone traps in each block, postharvest excavating around the trunks to search for borers and damage in the fall, and enclosing infested cankers with sleeve cages to assess adult emergence at the end of the season. Pheromone trap catches of both borer species were completely supressed by the pheromone dispensers in the disrupted plots. Fall 2000 trunk inspection revealed no damage attributable to PTB infestation in either the test trees or the untreated checks. In 2001, very low levels of damage were found in all plots, but there were no treatment differences. On unsprayed trees caged during 2001, higher numbers of LPTB pupal cases were found in non-disrupted peach blocks than in blocks treated with pheromones. Damaged areas on sprayed vs. unsprayed trees will be caged in 2002. Results will be used to assess the advisability of using pheromone mating disruption as a borer management strategy in commercial peach orchards.