Sunday, December 10, 2006 - 2:59 PM
0197

Impact of Rynaxypyr™ and new insecticide chemistries on the predator Deraeocoris brevis (Hemiptera: Miridae) and other natural enemies in pome fruits

Allison Walston, allison.walston@oregonstate.edu and Helmut Riedl, helmut.riedl@oregonstate.edu. Oregon State University, Mid-Columbia Agricultural Research & Extension Center, 3005 Experiment Station Drive, Hood River, OR

New insecticides for codling moth, Cydia pomonella (Linnaeus), control such as rynaxypyr are being evaluated in laboratory and field trials to determine impacts on natural enemies. The predaceous mirid Deraeocoris brevis Knight, the European earwig, Forficula auricularia Linnaeus, and the western predatory mite, Galandromus occidentalis (Nesbitt), are important natural enemies in pear and apple orchards. In laboratory bioassays, the full field rate of topically applied rynaxypyr caused no mortality in D. brevis adults or 2nd instar nymphs. The combined effect of multiple routes of exposure (topical, contact, oral) of rynaxypyr on D. brevis adults and nymphs are being investigated. Data on reproductive effects from chronic sub-lethal exposure in the nymph and adult stages will also be presented. In the field, rynaxypyr did not reduce populations of F. auricularia and G. occidentalis compared with the untreated check.


Species 1: Hemiptera Miridae Deraeocoris brevis
Species 2: Dermaptera Forficulidae Forficula auricularia (European earwig)
Species 3: Lepidoptera Tortricidae Cydia pomonella (codling moth)

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