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Biannual monitoring of pyrethroid and neonicotinoid susceptibility in Danish pollen beetle ( Meligethes aeneus F.) populations

This paper was not found in any repository; the policy of its publisher is unknown or unclear.
This paper was not found in any repository; the policy of its publisher is unknown or unclear.

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Abstract

The pollen beetle (Meligethes aeneus F.) is a serious pest in the northern countries in oilseed rape. To determine the present level of pyrethroid and neonicotinoid susceptibility of Danish pollen beetle populations, standardized methods recommended by IRAC (Insecticide Resistance Action Committee) were used. Pollen beetle populations were collected from 47 locations of Denmark with the help of the consultants and the farmers of the various regions in 2014. Further six populations were tested from Sweden and one from Germany. In the following year 2015, the monitoring continued to find out, if the resistance level which was determined in 2014 was stable in selected regions. Therefore pollen beetle populations from 14 locations in Denmark and five locations in Germany have been tested. For all tests the standardised methods for pyrethroids, the Adult-vial-test No. 11 and the Adult-vials-test No. 21 for neonicotinoids were used. All glass vials were provided by Bayer CropScience. In 2014 the tested populations in Denmark were 35 % resistant, about 29 % were classified as moderately resistant, and 37 % were susceptible towards λ – cyhalothrin in the glass vial tests. For thiacloprid, the majority of the tested populations in Denmark, showed a high susceptibility with >95%. The majority of tested populations in 2015, with λ –cyhalothrin were moderately resistant in Denmark. Further 36% were classified as resistant towards λ – cyhalothrin and 14% were susceptible. For the five tested population from Germany, 60% were moderately resistant and 40 % were resistant. For thiacloprid, the majority of the tested populations were highly susceptible in Denmark and Germany. The monitoring will be continued next year.