TOXICITY OF PERMETHRIN, AZINPHOSMETHYL, AND METHOMYL TO PHOLETESOR ORNIGIS (WEED) AND PHOLETESOR PEDIAS NIXON (HYMENOPTERA: BRACONIDAE), PARASITES OF THE SPOTTED TENTIFORM LEAFMINER, PHYLLONORYCTER BLANCARDELLA (FABR.) (LEPIDOPTERA: GRACILLARIIDAE)

Abstract

Can. Ent. 123: 1163-1 174 (1991) Leaves were collected between 28 July and 10 September from 36 (1986) and 85 (1987) apple orchards, and examined for mites. Twelve species of Phytoseiidae were found: Amblyseius fallacis (Garman), Typhlodromus longipilus Nesbitt, A. andersoni (Chant), T. caudiglans Schuster, T. pyri Scheuten, T. pomi (Parrott), Phytoseius macropilis (Banks), T. herbertae Chant, A. driggeri Specht, A. jinlandicus (Oudemans), T. conspicuus (Garman), and A. pusillus (Kennett), in order of frequency. The stigmaeid mites Zetzellia mali (Ewing) and Agistemus jleschneri Summers, a complex of erythraeid mites of Balaustium spp. and Hauptmannia spp., and tydeid mites, primarily Tydeus spp., were other common predatory species. Species of Tetranychidae, Bdellidae, Eriophyidae, Winterschmidtiidae, and Tarsonemidae, also were collected.Predatory mites were present each season in all abandoned orchards and in 43-74% of the commercial orchards. Their abundance in commercial orchards was compared with the use of insecticides applied only for control of the spotted tentiform leafminer, Phyllonotycter blancardella (Fabr.). Fewer ( P < 0.05) phytoseiids occurred where pyrethroids were employed than in sites without pyrethroids, but differences were not found for similar use of the carbamoyl oxime, methomyl. Fewer ( P < 0.05) stigmaeids occurred in sites treated with methomyl than in sites without methomyl, whereas such differences were not found for pyrethroid use. Thistlewood, H.M.A. 1991. Inventaire des acariens prkdateurs dans des pommeraies d'ontario soumises a divers traitements de pesticides. Can. Enr. 123: 1163-1 174. Resume Des feuilles de pommiers ont Ct C prClevCes entre le 28 juillet et le 10 septembre dans 36 vergers en 1986 et 85 vergers en 1987, et les acariens y ont Ct C dtnombrks. Douze especes de Phytoseiidae ont Ct C identifikes: ce sont, par ordre de frkquence, Amblyseius fallacis (Garman), Typhlodromus longipilus Nesbitt, A. andersoni (Chant), T. caudiglans Schuster, T. pyri Scheuten, T. pomi (Parrott), Phytoseius macropilis (Banks), T. herbertae Chant. A. driggeri Specht, A. jinlandicus (Oudemans), T. conspicuus (Garman), et A. pusillus (Kennett). Des Stigmaeidae, Zetzellia mali (Ewing) et Agistemus jleschneri Summers, un complexe d'Erythraeidae des genres Balaustium et Hauptmannia, et des Tydeidae, surtout du genre Tydeus, comptaient aussi parmi les especes prkdatrices communes. Des Tetranychidae, des Bdellidae, des Eriophyidae, des Winterschmidtiidae et des Tarsonemidae ont Cgalement Ct C identifiCs.Des acariens prkdateurs ont Ct C inventoriCs a chaque saison dans tous les vergers abandonnCs et dans 43-74% des vergers commerciaux. Leur abondance dans les vergers commerciaux a Ct C CvaluCe en fonction des insecticides utilisCs exclusivement dans le but de contrbler la mineuse Phyllonorycter blancardella (Fabr.). I1 y avait moins de phytoseiides ( P < 0,05) 1% oii des pyrtthrojdes avaient Ct C utilists que dans les vergers non trait&, mais il n'y avait pas de diffkrences entre les vergers ...