IRAC-US was the first Country Group organized after the formation of IRAC International in 1984. It is set up as a task force within CropLife America which is classified as a not-for-profit organisation (i.e. a 501(c)6 organization termed a business league not engaged in any regular for-profit business). The purpose of IRAC-US is two fold: first, to facilitate education and communication on insecticide resistance, and second, to promote the development of resistance management strategies to preserve the efficacy of…
…pair mating of field collected insects (field parents), and the sibling-mating of the F1 progeny (inbred family lines) to produce the F2 progeny to be screened (bioassayed) for the presence of resistance alleles using a discriminating concentration of an insecticide (Bird et al. 2017), ideally utilizing a method approved by IRAC (Table 1). Compared to the F2 screening procedure, F1 screens are simpler, but require the creation of a field-relevant, single-gene resistant strain and – as with F2 screens –…
(Incorporating the OSR & Pollen Beetle Groups) Pyrethroid resistance has been recorded in European populations of the pollen beetle (Meligethes aeneus) since 1999, when it was first reported in Eastern France. Pyrethroid insecticides have long been favoured as the method of control for insect pests of oilseed rape and a lack of alternative insecticides with different modes of action, has ensured a continued high selection pressure for pyrethroid resistance. This has lead to the spread of resistant pollen beetle…