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Summary Pollen beetle (Meligethes aeneus F.) and cabbage seed weevil (Ceutorhynchus assimilis Payk.) occur very often at the same time in winter and spring oilseed rape in Polish climatic conditions. The aim of the study was to determine the susceptibility of pollen beetle and cabbage shoot weevil to the same, selected active substances of insecticides from the group of pyrethroids, organophosphates and neonicotinoids recommended in Poland. The studies were conducted with the use of contact-stomach method, which involves tested beetles exposition to treated leaves and inflorescences of host plants. The results indicated high or very high pollen beetle resistance to pyrethroid active substances (the exception was tau-fluwaliant to which the pest showed susceptibility or weak resistance) and some level of cabbage seed weevil resistance to neonicotinoids. The results clearly indicate that the protection of oilseed rape in Poland requires continuous monitoring of resistance level of both pests and regular update of control programs for both species.

progress in plant protection

Differentiation of susceptibility levels of oilseed rape pests to the same active substances of insecticides on the example of pollen beetle and cabbage seed weevil