Diabrotica virgifera virgifera (western corn rootworm) is certainly the most damaging pest among the pest species found in corn crops from the western part of Romania. Attack frequency of this pest is analyzed in an experience placed near Şagu locality – S.C. Agrogil, Arad County area. The purpose of this work is to establish the damages produced by Diabrotica virgifera virgifera pest larvae on corn plants. In this way, during 2006 there were studied eight corn hybrids from different maturity groups with American origin. These researches will allow us to establish the role of this pest on the amplifying of corn pathological systems under epidemic view (Zea mays - Fusarium roseum, Zea mays - Ustilago maydis, Zea mays - Helminthosporium turcicum, pathogens monitored during 2006). After the result analysis we can conclude the next: Diabrotica virgifera virgifera larvae attack amplitude varies between 5.17% and 13.78%, values registered in case of PR 36K67 and PR 39D81 hybrids. Control variant is represented by PR 37D25 a half-early hybrid and it has shown a 5.45% attack percentage. Statistically are registered very distinctively significant and distinctively significant attacks in case of PR 39D81, PR 38R92 and PR 37M34 hybrids in comparison with the tester. The other hybrids show small differences in comparison with the tester, not statistically provided, but these differences are important from practical point of view.

Diabrotica virgifera virgifera Le Conte; hybrid; corn; larvae; frequency

Presentation: oral