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Effects of azinphos‐methyl and pyrifenox on reproductive performance of Cydia pomonella L. (Lepidoptera: Tortricidae) at recommended rates and lower concentrations
Author(s) -
ABIVARDI CYRUS,
WEBER DONALD C.,
DORN SILVIA
Publication year - 1998
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1998.tb05182.x
Subject(s) - codling moth , tortricidae , biology , lepidoptera genitalia , spermatophore , mating disruption , mating , toxicology , horticulture , pest analysis , larva , botany , zoology
Summary The effects of deposits of commercial formulations of azinphos‐methyl, an organophosphorous insecticide and acaricide, and pyrifenox, a systemic fungicide, on artificial surfaces on the survival and reproductive performance of codling moth adults, Cydia pomonella L., were examined in the laboratory. In contrast to pyrifenox, which did not influence the codling moth significantly, azinphos‐methyl affected the insect in a number of ways: (1) it exhibited a strong direct insecticidal activity on adults, eggs and larvae; (2) at low concentrations, it decreased copulation significantly, as reflected by a reduction in the number of spermatophores contained per female; and it inhibited oviposition strongly; (3) at low concentrations moths copulated more often initially and produced more eggs than the controls. However, if the moths were kept in contact with the azinphos‐methyl residues, they and their progeny 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.