Long-term residual efficacy of commerical formulations of 16 pesticides toTyphlodromus pyri Scheuten (Acari: Phytoseiidae) inhabiting commerical vineyards
The long-term residual efficacy of 16 pesticides to the predatory phytoseiid mite,Typhlodromus pyri Scheuten, inhabiting commercial sprayed vineyards in South Moravia, Czchoslovakia, was evaluated in laboratory bioassays. Omethoate, chlorpyrifos-methyl and esfenvalerate were assessed as harmful and should not be sprayed. Mancozeb-efosite-Al mixture, diazinon, dicofol, bromopropylate, azinphos-ethyl and phosmet were assessed as moderately harmful. Fenitrothion, phosalone and mancozeb were assessed as slightly harmful and some of them had delayed detrimental effect on the predatory mites. These pesticides can be used only cautiously in IPM programs. Sulphur, penconazole, trimorfamid and endosulfan were assessed as harmless and can be recommended for vineyards withT. pyri.
Lutte biologique contre les insectes nuisibles
L'invention se rapporte a la lutte biologique contre des dipteres autres que les moustiques, et qui consiste a utiliser l'isolat HD 541 (NCIMB 40373) ou HD 571 (NCIMB 40374) de Bacillus thuringiensis, ou un mutant, un produit de recombinaison ou un derive de cet isolat, ou une substance insecticide qui en est derivee.
VII. Azinphosmethyl resistance in strains of Typhlodromus pyri from Nelson
Abstract The mite Typhlodromus pyri Scheuten (Acari: Phytoseiidae), a predator of European red mite Panonychus ulmi (Koch), was detected in 16 of 22 surveyed apple orchards (1975) in Nelson, New Zealand. Azinphosmethyl had been used extensively on these properties for some years for codling moth and leafroller moth control, and suggestions of field tesistance to azinphosmethyl by T. pyri were confirmed in laboratory tests. Detailed toxicological examination of T. pyri from four properties established LC50 values for three strains considerably higher than previously determined values from Nelson orchards (1971). LC50 values ranged from 0.08% to 0.30% a.i. azinphosmethyl. The LC50 for the Appleby-R strain previously tested in 1971 increased from 0.07% to 0.30% from 1972 to 1976. the slopes of the dosage-mortality lines were similar for all strains. Integrated control of European red mite using T. pyri appears feasible at the detected levels of resistance. LC50 values increased curvilinearly in response to c...