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Open AccessArticle

Codling Moth Wing Morphology Changes Due to Insecticide Resistance

1
Department for Agricultural Zoology, Faculty of Agriculture, University of Zagreb, 10000 Zagreb, Croatia
2
Departamento de Biología, Facultad de Ciencias, Universidad de Tarapaca, Arica 1000000, Chile
3
South Coast Structural Engineers, P.O. Box U9 Wollongong, NSW 2500, Australia
4
Centre for Sustainable Ecosystem Solutions, Faculty of Science, Medicine and Health, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW 2522, Australia
*
Author to whom correspondence should be addressed.
Insects 2019, 10(10), 310; https://doi.org/10.3390/insects10100310
Received: 16 August 2019 / Revised: 13 September 2019 / Accepted: 17 September 2019 / Published: 21 September 2019
(This article belongs to the Special Issue Monitoring and Detection of Insect Resistance)
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 CM has led to resistance development. In this study, the forewing morphologies of 294 CM (11 populations) were investigated using geometric morphometric 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. FEM revealed that as wind speed (m/s−1) increased, so too did wing deformation (mm) for CM from each of the three treatments modelled. CM from the ecological orchards displayed the least deformation followed by integrated then laboratory-reared CM, which had the highest wing 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. View Full-Text
Keywords: geometric morphometrics; finite element method; forewing shape; biomarker geometric morphometrics; finite element method; forewing shape; biomarker
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Pajač Živković, I.; Benitez, H.A.; Barić, B.; Drmić, Z.; Kadoić Balaško, M.; Lemic, D.; Dominguez Davila, J.H.; Mikac, K.M.; Bažok, R. Codling Moth Wing Morphology Changes Due to Insecticide Resistance. Insects 2019, 10, 310.

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