Oxydemeton-Methyl Resistance, Mechanisms, and Associated Fitness Cost in Green Peach Aphids (Hemiptera: Aphididae)

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Susceptibility to oxydemeton-methyl and imidacloprid, and the inhibitory effects of oxydemeton-methyl and some organophosphate compounds on acetylcholinesterase (AChE) and carboxylesterase activity were studied in two populations (Karaj and Rasht) of green peach aphids, Myzus persicae (Sulzer). Results show that the Karaj population was resistant to oxydemeton-methyl but susceptible to imidacloprid. The esterase activity of the resistant and susceptible populations suggests that one of the resistance mechanisms to oxydemeton-methyl was esterase-based. The inhibition assay shows that the AChE of the Karaj population is less sensitive to oxydemeton-methyl and paraoxon derivatives. Regarding the paraoxon derivatives, the smaller paraoxon side chain is more potent against the modified AChE than against the AChE from the susceptible strain. Fertility life table parameters of green peach aphid populations resistant and susceptible to oxydemeton-methyl also were studied under laboratory conditions. The standard errors of the population growth parameters were calculated using the Jackknife method. Results showed that susceptible strain exhibits a significantly higher rm than the resistant strain, probably because the resistant strain had a higher generation time than the susceptible strain. These results suggested that the resistant Karaj strain may be less fit than the susceptible strain.

Keywords: Myzus persicae; fertility life table; fitness cost; resistance to insecticide

Document Type: Research Article

Publication date: August 1, 2008

More about this publication?
  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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