Research on the establishment of chemical control technology on adults of species Diabrotica virgifera virgifera Le Conte (western corn rootworm).

The potential of damage of Diabrotica virgifera virgifera Le Conte species increasing year by year in Romania, in western part of the country where the pest was discovered (1996), tends to become a regular presence in maize crops and had a large area positioning as a key pest in maize monoculture or in crops cultivated year after year. The chemical control of adults constituted an important strategy for decreasing of density population and in the same time the decreasing of laying eggs and limitation of appearance area. Major damage made by adults and larvae were noticed in the maize crop monoculture conditions and maize crop monoculture conditions and maize crop in the first year. Using insecticides based on cipermetrin, imidacloprid, lambda cihalotrin, deltametrin, zeta-cipermetrin, tiacloprid, at density which is over economic threshold (10 adults/m 2 ) assured a high efficacy and are recommended against adults of Diabrotica virgifera virgifera Le Conte species .