EFFECTS OF AZINPHOS-METHYL AND PYRIFENOX ON REPRODUCTIVE-PERFORMANCE OF CYDIA-POMONELLA L (LEPIDOPTERA, TORTRICIDAE) AT RECOMMENDED RATES AND LOWER CONCENTRATIONS

The effects of deposits of commercial formulations of azinphos-methyl, an organophosphorous insecticide and acaricide, and pyrifenox, a syst emic fungicide, on artificial surfaces on the survival and reproductiv e performance of codling moth adults, Cydia pomonella L., were examine d in the laboratory. In contrast to pyrifenox, which did not influence the codling moth significantly, azinphos-methyl affected the insect i n a number of ways: (1) it exhibited a strong direct insecticidal acti vity on adults, eggs and larvae; (2) at low concentrations, it decreas ed copulation significantly, as reflected by a reduction in the number of spermatophores contained per female; and it inhibited oviposition strongly; (3) at low concentrations maths copulated more often initial ly and produced more eggs than the controls. However, if the moths wer e kept in contact with the azinphos-methyl residues, they and their pr ogeny died the following day so that the total number of eggs laid was reduced. Possible implications of the stimulatory effects, as well as repellency, of combined use of azinphos-methyl in the phermone mating disruption technique are discussed.