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Fitness costs in clothianidin-resistant population of the melon aphid, Aphis gossypii

Abstract : Clothianidin is a second-generation neonicotinoid insecticide, widely used against sap-sucking insect pest including melon aphid,Aphis gossypiiGlover (Hemiptera: Aphididae). This pest causes severe economic damage to Cucurbitaceae plants worldwide. In this study, we investigated clothianidin resistance development under continuous selection pressure. Moreover, the age-stage, two-sex life table approach was used to evaluate the impact of clothianidin resistance on the fitness ofA.gossypii. A clothianidin resistant strain (CT-R) with a 23.17-fold resistance level was developed from a susceptible strain (CT-S) after continuous selection for 24 generations. Life table results showed a significant reduction in the relative fitness (0.847) of CT-R strain compared to the CT-S strain ofA.gossypii. The developmental duration, oviposition days, total pre-oviposition period (TPOP), longevity, and fecundity of CT-R strain were found to be significantly lower when compared to CT-S strain. The demographic parameters, including the intrinsic rate of increase (r), finite rate of increase (lambda), net reproductive rate (R-0), and mean generation time (T) were also significantly decreased in CT-R strain compared to the CT-S strain. Both the reproductive and survival rates were affected by clothianidin resistance in CT-R strain compared with the CT-S strain ofA.gossypii. Overall, our results demonstrate that in-depth knowledge about the trade-off at play between resistance degree and fitness cost might be useful to design resistance management strategies againstA.gossypii.
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Submitted on : Monday, July 5, 2021 - 3:20:03 PM
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Farman Ullah, Hina Gul, Kaleem Tariq, Nicolas Desneux, Xiwu Gao, et al.. Fitness costs in clothianidin-resistant population of the melon aphid, Aphis gossypii. PLoS ONE, Public Library of Science, 2020, 15 (9), pp.e0238707. ⟨10.1371/journal.pone.0238707⟩. ⟨hal-03278398⟩



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