Researches Regarding the Species Diabrotica Virgifera Virgifera Le Conte in Sibiu County

From the very beginning of the recording of its appearance in Europe as well as in our country the published material emphasized the harmful potential of the pest Diabrotica virgifera virgifera also drawing the attention to the scientific world and to the farmers as well upon this factor of reduction of the production of corn. In Sibiu County this species was first recorded in 2001, coming from West, at the border with Alba County. The first gatherings were done in Miercurea Sibiului. The investigation was done during 2001–2009 concerning in: monitoring the adults and the larvae, the identification of the attacked plants, the way of harming both for the adults and larvae. The gathering area was extended to 37 localities in Sibiu County. The researches were done in the field in single corn cultures occupying surfaces larger then 2 hectares where put pheromone traps were “Atravirg” and yellow traps (panels). There was gathered a total number of 2,149 adults. In the lab there were analyzed plants presenting the so called swan neck as well as healthy plants. Their roots were weighed. The localities in the Sibiu County that were most affected by the attack of the pest were Agnita and Ocna Sibiului. The large share cultivated with corn, the single culture of corn as well as the climate brought their contribution to the spreading of this pest in the territory of Sibiu County.