Discovery of metabolic resistance to neonicotinoids in green peach aphids (Myzus persicae) in Australia

Abstract

M. persicae populations in parts of Australia are now resistant to four different insecticide chemical groups, raising concerns about the long-term management of this pest. While higher copy numbers of CYP6CY3 were seen in all resistant populations, the number of gene copies was not strongly correlated with the level of resistance as determined by LD values generated through bioassays. This finding sheds further light on the complexity of the P450 genes in regulating neonicotinoid resistance. © 2016 Society of Chemical Industry.

Occurrence of target‐site resistance to neonicotinoids in the aphid Myzus persicae in Tunisia, and its status on different host plants

“…Extensive monitoring has failed to detect its presence further north in Europe despite continuing and extensive reliance on neonicotinoids for aphid control in countries such as the UK . It was also absent in samples collected in Australia . The geographical spread of R81T southwards but not northwards suggests an influence of factors such as climate and pest biology in determining its spread rather than simply the intensity of neonicotinoid applications.…”

“…8 It was also absent in samples collected in Australia. 31 The geographical spread of R81T southwards but not northwards suggests an influence of factors such as climate and pest biology in determining its spread rather than simply the intensity of neonicotinoid applications. Target-site resistance conferred by R81T is incompletely dominant in expression, 32 and less likely to be selected where M. persicae populations are predominantly anholocyclic (asexual), which is generally the case in Australia and the UK.…”

Neonicotinoid insecticide residues in New Zealand maize paddock soil

“…Chronic exposure to sublethal concentrations of a toxicant are an evolutionary pressure that selects for resistive mechanisms (Orr 1998). Resistance to imidacloprid has already been documented in the USA in Colorado potato beetle, Leptinotarsa decemlineata, across Southeast Asia in the brown planthopper Nilaparvata lugens, and in Australian green peach aphids, Myzus persicae (Alyokhin et al 2007, de Little et al 2016, Garrood et al 2016. The latter species is found throughout New Zealand and is an economically important pest on many crops.…”

Escalating insecticide resistance in Australian grain pests: contributing factors, industry trends and management opportunities

“…Most horticultural crops in Australia, for example, receive on average more insecticides per growing season than grain crops, and a handful of studies have revealed high gene flow in pests across horticultural and grain industries (e.g. de Little et al 38 ). Where available, scientists should make use of genetic markers to aid monitoring programs.…”