Evaluation of Insecticidal Activity of Pesticides Against Hemipteran Pests on Apple Orchard

Abstract Stink bugs do damage on various crops including upland crops and tree fruits. Especially, yellow-brown stink bug (Halyomorpha halys (Stal)) and brown-winged green (Plautia stali) are severely damaged onapple orchard. Using seven insecticides - dinotefuran WP, etofenprox WP, chlorpyrifos WP, cabaryl WP,chlothianidin SC, flonicamid WG, and bifenthrin WG - registered on apple, contact and residual toxicitieswere tested on both male and female of P. stali and H. halys that preferred apple fruit. Contact toxicity ofdinotefuran WP was excellent on male P. stali 48 hours after treatment (HAT) with 96.7% and significant onmale Halyomorpha halys 48 HAT with 74.5% but the others had low effect. Contact toxicity on these stinkbugs were higher in male than female. All insecticides except flonicamid, residual effects were all effectiveon both male and female of P. stali, while chlorpyrifos and bifenthrin were showed higher residual toxicityon both male and female of H. halys in laboratory condition. Two insecticides, chlorpyrifos and bifenthrin,were selected for the field test. Bifenthrin have a high residual effect on P. stali until 5 days after treatment,but have a low residual toxicity on H. halys in the field test. Chlorpyrifos showed higher residual toxicity inthe laboratory, however, showed low residual efficacy on two species stink bug onto the field. Key words Stink bugs, Halyomorpha halys, Plautia stali, Contact toxicity, Residual effect, Dinotefuran, Apple