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Insecticide-resistant pollen beetles (Meligethes aeneus F) found in Danish oilseed rape (Brassica napus L) fields
- Hansen, Lars Monrad
- Pest management science 2003 v.59 no.9 pp. 1057-1059
- Brassica napus var. napus, Meligethes aeneus, dimethoate, esfenvalerate, insecticide resistance, lambda-cyhalothrin, oilseeds, pests, pollen, pyrethrins, spring, winter
- The pollen beetle is the most important pest in Danish oilseed rape fields. In 2001, we screened a broad range of pollen beetle populations for pyrethroid and dimethoate resistance. A standard dip-test was used to test insecticide resistance in 18 populations collected from oilseed winter and spring rape fields. The beetles were treated with four different insecticides: the pyrethroids tau-fluvalinate, lambda-cyhalothrin and esfenvalerate, and the organophosphate dimethoate. The results show that up to 99% of the pollen beetles survived Danish standard doses of pyrethroids and up to 36% of the beetles survived standard doses of dimethoate.