engleski

Sensitivity of Cereal Leaf Beetle to insecticides in period 2018-2021

The cereal leaf beetle (Oulema melanopus L., 1758) is one of the most important cereal pests, and its control relies exclusively on the use of insecticides. The study of the susceptibility of the adult forms of the cereal leaf beetle to the insecticides approved for this purpose was carried out within the program "Monitoring of resistance of harmful organisms to pesticides". Populations of cereal leaf beetle were collected from untreated crops at 34 locations in 2018, 2019, and 2021. Sensitivity tests were conducted according to IRAC Test Method No. 007 and preparations based on the active ingredients chlorpyrifos, cypermethrin, lambda-cyhalothrin, deltamethrin, and thiacloprid were used. In 2018, reduced sensitivity to cypermethrin was found in 40% of the tested populations. In 2019, only one test population was found to have reduced sensitivity to chlorpyrifos, while the active ingredients cypermethrin and thiacloprid were found to have reduced sensitivity in 83% of the tested populations. In 2021, 17% of tested populations showed reduced sensitivity to the active ingredient lambda-cyhalothrin and 54% of tested populations showed reduced sensitivity to the active ingredient deltamethrin. Because reduced sensitivity to the tested active ingredients was observed at some locations, it is necessary to use insecticides with different mode of action to avoid and prevent the development and spread of possible resistance of the cereal leaf beetle to the tested insecticides.

cereal leaf beetle, sensitivity, OP insecticides, pyrethroids, neonicotinoids

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