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Toxicity of azinphos‐methyl to various development stages of the codling moth Cydia pomonella (Lepidoptera: Tortricidae)
Author(s) -
Reuveny Haim,
Cohen Ephraim
Publication year - 2007
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.1299
Subject(s) - codling moth , tortricidae , larva , lepidoptera genitalia , biology , instar , toxicology , pesticide , pest analysis , population , horticulture , botany , ecology , medicine , environmental health
The response to azinphos‐methyl of different life‐stages of the codling moth Cydia pomonella (L.) was studied. A similarity in response to azinphos‐methyl (LC 50 , LC 90 ) was observed in neonate larvae obtained from the first and second generations of field populations. Mortality rates for neonate larvae of a field population cross‐bred with a laboratory colony were lower (by a factor of 1.2–2.2) in comparison with field neonate larvae. The mortality rate of larvae from a laboratory colony exposed to artificial diet containing azinphos‐methyl gradually decreased at older instars. The mortality rates of fifth‐instar larvae were remarkably low when exposed to artificial diet mixed with azinphos‐methyl or when topically treated with the insecticide. One‐ to three‐day‐old females were more sensitive than males of the same age, whereas the opposite was observed in 14–to 17‐day‐old adults. Mortality rates of 14‐ to 17‐day‐old adults were higher than those under 10 days old. No significant difference in sensitivity to the organophosphorus compound was noticed between the sexes of 7‐ to 10‐day‐old adults. Neonate larvae of the codling moth can serve as a target life‐stage for various groups of pesticides, and the importance of using such a stage as a standardized methodology for monitoring resistance in the codling moth is discussed. Copyright © 2006 Society of Chemical Industry