engleski

Sensitivity of stem mining weevils to insecticides in 2019 and 2021

Stem weevils in oilseed rape are controlled exclusively by the use of chemical insecticides, and resistance to certain active ingredients has already been detected. The aim of this study was to test stem weevil populations to insecticides approved for this purpose. It was conducted as part of the program "Monitoring of resistance of harmful organisms to plant protection products" program. Adult forms of stem weevils were collected from 10 locations from untreated crops in 2019 and 2021. The tests were carried out according to IRAC test method No. 031 and preparations based on the active ingredients chlorpyrifos, cypermethrin, lambda-cyhalothrin, deltamethrin, thiacloprid and acetamiprid were used. In 2019, 25% of the population was found to have suspected resistance to the active ingredient lambda-cyhalothrin, while 80% of the population was found to have reduced susceptibility to the active ingredient thiacloprid and 25% of the population to the active ingredient acetamiprid. In 2021, resistance to the active ingredients lambda-cyhalothrin and deltamethrin was suspected in 40% of the populations. Reduced susceptibility to the active ingredient deltamethrin was detected in 20% and to the active ingredient acetamiprid in 40% of the populations. Based on the results on susceptibility of individual populations, it is necessary to use insecticides for which no resistance or reduced susceptibility was found and to apply alternative control measures.

oilseed rape, weevils, OP insecticides, pyrethroids, neonicotinoids

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