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The western corn rootworm (Diabrotica virgifera virgifera LeConte; WCR) is a  serious maize pest in Croatia. The species was first registered in Europe in  the early 1990s and since then became one of the most dangerous maize pests,  especially in parts of Central and Southeast Europe. Larvae that feed on the  maize roots cause the most serious damages in maize fields. Management of  this pest is difficult and expensive, with possible serious impact on the  environment. Native (or host-plant) resistance of maize against WCR could  provide new economically and ecologically sustainable options in WCR  management. Main goal of this study was to assess the variability of maize  germplasm, correlations among resistance traits, and detect potential sources  of resistance that could be used in breeding programs in order to develop  hybrids with higher level of resistance against WCR. To our knowledge, the  first native resistant hybrid is yet to be registered. Results showed great  variability of estimated germplasm. Effect of the genotype was significant in  all environments, as well as many interactions between genotype and the  environment. Significant interactions emphasize the importance of the  environment in WCR native resistance research. Significant positive  correlations among all traits were detected. Several inbred lines were  selected as a potentially useful germplasm for resistance breeding programs.

Maize germplasm of eastern Croatia with native resistance to western corn rootworm (Diabrotica virgifera virgifera LeConte)