AN ANALYSIS OF SLOW ACTIVE INGREDIENT PERMEATION THROUGH INSECTS’ CUTICLE AS THE MECHANISM OF CABBAGE SEED WEEVILS ’(CEUT ORHYN CHUSASSIMILI SPAYK.) (COLEOPTERA: CURCULIONIDAE) IN SEN SITIVITY TO INDOXACARB

摘要

The cabbage seed weevil and pollen beetle are the most dangerous winter rapeseed pests in Poland and other EU countries. Although the two insects are usually found together in fields and consequently, the history of controlling both pests is similar, the cabbage seed weevil is characterised by completely different sensitivity to pyrethroids and oxadiazines than the pollen beetle. As earlier studies proved that WKHFDEEDJHVHHGZHHYLO¶VLQVHQVLWLYLWWRLQGRDFDUE was not caused by enzymes inactivating the active ingredients of insecticides, the aim of this study was to determine the possible share of slow permeation of toxins through body coverings as the mechanism responsible for this phenomenon. The susceptibility level of both species to deltamethrin (pyrethroids) and indoxacarb (oxadiazines) was tested and the resLGXHV RI ERWK WRLQV LQ WKH SHVWV¶ RUJDQLVPV ZHUH measured. The tests proved that there were similar amounts of deltamethrin and indoxacarb residues in both insects. The research findings give grounds for excluding the responsibility of the slow penetration PHFKDQLVPIRUWKHFDEEDJHVHHGZHHYLO¶VLQVHQVLWLY ity to indoxacarb and show that there are other mechanisms, which have not been discovered yet.