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Codling moth wing morphology changes due to insecticide resistance

By Ivana Civkovic, Hugo A Benitez, B Baric, Zrinka Drmic, Martina Balasko, Darija Lemic, Jose Humberto Dominguez, Katarina Maryann Mikac and Renata Bazok

Abstract

The codling moth (CM) (Cydia pomonella L.) is the most important apple pest in Croatia and Europe. Owing to its economic importance, it is a highly controlled species and the intense selection pressure the species is under has likely caused it to change its phenotype in response. Intensive application of chemical-based insecticide treatments for the control of CMhas led to resistance development. In this study, the forewing morphologies of 294 CM(11 populations) were investigated using geometricmorphometric procedures based on the venation patterns of 18 landmarks. Finite element method (FEM) was also used to further investigate the dispersal capabilities of moths by modelling wing deformation versus wind speed. Three treatments were investigated and comprised populations from integrated and ecological (susceptible) orchards and laboratory-reared non-resistant populations. Forewing shape differences were found among the three treatment populations investigated. Across all three population treatments, the movement of landmarks 1, 7, 8, 9, and 12 drove the wing shape differences found. A reliable pattern of differences in forewing shape as related to control practice type was observed. FEMrevealed that as wind speed (m/s-1) increased, so too did wing deformation (mm) for CMfrom each of the three treatments modelled. CMfrom the ecological orchards displayed the least deformation followed by integrated then laboratory-reared CM,which had the highestwing deformation at the highest wind speeds. This study presents an affordable and accessible technique that reliably demonstrates wing shape differences, and thus its use as a population biomarker to detect resistance should be further investigated

Publisher: 'Sociological Research Online'
Year: 2019
OAI identifier: oai:ro.uow.edu.au:smhpapers1-1986
Provided by: Research Online
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