Toxicity of Insecticides on Trioxys Pallidus, the Walnut Aphid and the Codling Moth

The benzoylphenyl urea insect growth regulators (IGRs), diflubenzuron, alsyston, CGA 112913, UC 62644 and Thuringiensin, were tested on adult and late third instar Trioxys pallidus and first instar walnut aphids. The organophosphates, phosalone and azinphosmethyl were used as positive controls. The IGRs and Thuringiensin were not acutely toxic to adult and larval Trioxys when contact, topical and ingestion methods of application were used. These chemicals had no contact effects on 1st instar aphids. Azinphosmethyl and phosalone were highly toxic to both the parasite and aphid. However, phosalone when topically applied to mummified aphids did not reduce emergence rates of adult parasites. No detrimental effects on reproduction for both Trioxys and aphids were detected. A colony of codling moth was initiated in August, 1984. Bioassays with the above IGRs and Thuringiensin on the codling moth will be completed by July, 1985. Eggs, first instar, and adult moths will be used to determine acute and reproductive effects.