Current problems concerning flea beetle (Phyllotreta spp.) control from oilseed rape crop, in Romanian plane.

Flea beetle (Phyllotreta spp.) is one of the main pest of oilseed rape crop, in south and south-east of the Romania. The insect is dangerous during autumn, when plants are in first vegetation stages (BBCH 10-13). At NARDI Fundulea, researches concerning effectiveness of both, current and new active ingredient insecticides, used like seed treatment against this pest were performed. The weather conditions influence on this insect, during first vegetation stages of oilseed rape plants was also studied. In last six years (2009-2014), climatic conditions from autumn period were variable. Generally, average temperatures from period under study were over multiyear average while rainfalls amount were below multiyear average. The attack of flea beetle at oilseed rape untreated plants was high in conditions of the years 2010 and 2011 (attack degree 19.5 and 25.7%). In 2010, even if both average temperature registered in period when oilseed rape plants are in first vegetation stages were below multiyear average and rainfalls amount were over multiyear average, the attack of flea beetle at untreated plants were higher, as result of daily distributions of temperatures in second decade of October, that were favorable for pest. The imidacloprid + beta-ciflutrin and clotianidin + beta-ciflutrin – based insecticides provide a good protection for oilseed rape plants against flea beetle (Phyllotreta spp.) attack, under 2013 and 2014 autumn conditions. The differences between this treated variants and untreated (control) variant was statistically assigned. Cuvinte cheie: Puricii de pământ (Phyllotreta spp.), schimbări climatice, tratament seminţe, restricţii.