engleski

The occurence of lower sensitivity pollen beetle (Meligethes spp.) populations to chlorpyriphos in winter oilseed rape (Brassica napus L.)

Pollen beetle (Meligethes spp.) is the most important oilseed rape pest. If no control measures are conducted, this pest could cause even more than 50% reduction of the yield which is the reason of high insecticides input every year. Due to frequent use of insecticides for its control in the last decade, the resistance of pollen beetle to pyrethroids was confirmed. In order to test sensitivity of adult forms to chlorpyriphos, 52 populations were collected at different oilseed rape fields in 2013 and 2014. For each sample were determined coordinates using GPS (Global positioning system). Based on the collected data the database in GIS (Geographic information system) was created. In a laboratory experiment they were tested according to IRAC Susceptibility Test Method No: 025. Results show lower chlorpyriphos efficiency, with potential to be tolerant, on eight pollen beetle populations located in three eastern counties where the highest amount of arable crops is located. This is the first record of low sensitivity pollen beetles to chlorpyriphos in Europe.

resistance; chlorpyriphos; pollen beetle; oilseed rape

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