Imidacloprid‐resistant Aphis gossypii populations are more common in cotton‐dominated landscapes

Abstract

BACKGROUND: Widespread reports of reduced efficacy of imidacloprid for managing cotton aphids (Aphis gossypii Glover) in cotton (Gossypium hirsutum L.) prompted an investigation to characterize the susceptibility of 43 populations over a 2-year period. The susceptibility of A. gossypii populations to imidacloprid was examined by calculating LC50 values. Further analyses related resistance assay results to a gradient of cotton production intensity.RESULTS: Concentration-mortality bioassays documencted populations that were 4.26-607.16 times more resistant than the susceptible laboratory population. There was a significant positive relationship between LC 50 values and percentage of cotton within 2.5-and 5-km buffers surrounding collection sites. No significant relationship was detected between LC 50 values and the percentage of alternative crop and noncrop hosts.CONCLUSION: Variable and high levels of resistance were detected in A. gossypii populations, and this variation was positively associated with cotton production intensity. Cotton is a host that may receive multiple applications of neonicotinoids (via seed treatment and foliar sprays) annually for seedling and mid-season pests. Rotating modes of action and limiting insecticide use should be implemented to delay the evolution of insecticide resistance in A. gossypii populations.

Insecticide resistance monitoring and diagnostics of resistance mechanisms in cotton‐melon aphid, Aphis gossypii Glover in Central China

“…The precondition of scientific chemical insecticides application to control A. gossypii is to master the response of A. gossypii to insecticides in the field through resistance monitoring under the concept of green plant protection. Resistance monitoring as an indispensable component of integrated A. gossypii management has been carried out in many regions previously (Li et al, 2022; Mahas et al, 2022; Toda et al, 2008). In this study, the resistance levels of six commonly used insecticides to 15 field populations of A. gossypii in Central China were monitored using leaf‐dipping method.…”

“…was found in all field populations, and almost all of them were homozygous resistance genotype, only 10% of susceptible homozygote was detected in Henan Xinyang population (HNXY-2020; Figure 5). carried out in many regions previously (Li et al, 2022;Mahas et al, 2022;Toda et al, 2008). In this study, the resistance levels of six commonly used insecticides to 15 field populations of A. gossypii in Central China were monitored using leaf-dipping method.…”

Salivary gland transcriptomics of the cotton aphid Aphis gossypii and comparative analysis with other sap‐sucking insects

“…The cotton‐melon aphid, Aphis gossypii , is a cosmopolitan and polyphagous sap‐sucking insect that threatens agricultural crop production by infesting more than 116 plant families, including Solanaceae, Malvaceae, and Cucurbitaceae (Blackman and Eastop, 2000; Herron and Wilson, 2017). The current control measures include chemical insecticides, resulting in resistance and cross‐resistance to insecticides in A. gossypii (Mahas et al, 2023; Nauen and Elbert, 2003; Ullah et al, 2020). Therefore, novel aphid control strategies with fewer environmental impacts must be developed using the molecular basis of aphid‐plant interactions.…”

Impact of biopesticides on the probing and feeding behavior of Aphis gossypii

“…Synthetic pesticides have long been the major tool for controlling arthropod pests, diseases, and weeds in agricultural cropping systems worldwide (Guedes et al 2016). However, the strong reliance on these chemicals has led to an increase in pest resistance (Mahas et al 2022), secondary pest outbreaks and resurgence, besides posing a serious threat to the environment, human health, and the provision of ecosystem services (Desneux et al 2007;Rani et al 2021). Therefore, sustainable alternatives to synthetic pesticides for pest management are urgently needed.…”