ISSN 2285-5785, ISSN CD-ROM 2285-5793, ISSN ONLINE 2285-5807, ISSN-L 2285-5785


Published in Scientific Papers. Series A. Agronomy, Vol. LXIII, Issue 2
Written by Nedyalka PALAGACHEVA, Liljana KOLEVA, Yanko DIMITROV, Lilko DOSPATLIEV

Pollen beetle (Meligethes aeneus F.) as a key rape pest is controlled by use of a wide range of insecticides, to maintain low density. The downside of this method is destruction of the beneficial entomofauna, pollinators the possibility of developing resistance. Massive use in the synthetic pyrethroids to control the pollen beetle led to reduction their efficacy. Therefore, it is determined insecticidal resistance of pollen beetle (Meligethes aeneus F.) to synthetic pyrethroids. Resistance is refining by Bioassays, which includes a study of the reaction of an organism to a given substance, taking into account the concentration changing influences. To this end, they gathered pollen beetles for analysis. The results of the research proved presence of 10% resistance of pollen beetle (M. aeneus) to cypermethrin after 24 hours of action at the highest concentration of 0.250 ppm/cm2 .It was found, that the concentration and duration of cypermethrin action are inversely proportional of the resistance of the elderly.

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