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Rezistence dřepčíků a stonkových krytonosců na řepce k vybraným insekticidům
 Richterová, Terezie
The aim of this thesis is to evaluate the selection of resistance to selected insecticides in populations of flea beetles and stem weevils collected from conventional oilseed rape fields in the Czech Republic during 2021 and 2022. Testing for resistance to the active ingredients lambda-cyhalothrin, tau-fluvalinate and acetamiprid was carried out according to the methods IRAC (Insecticide Resistance Action Committee) No. 011 and 021. The statistical program Polo Plus 2.0 was used to evaluate the tests, the percentage efficiencies, degrees of resistance and lethal doses were determined. Based on the results, it was found that the populations of flea beetles show resistance to lambda-cyhalothrin. Populations of the cabbage stem weevil show resistance to lambda-cyhalothrin and tau-fluvalinate. To the substance acetamiprid, the populations of stem weevils are currently sensitive. It is therefore necessary to apply anti-resistance strategies to these pests in order to prevent further selection of resistance.
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