Efficacy of some insecticides in the control of western corn rootworm adults (Diabrotica virgifera virgifera LeConte) in Bosnia and Herzegovina.
The issue of combating pests in crop production has been and will remain a major challenge for all participants in and around plant production and protection of stored plant products. The problem of adequate protection from pests is further complicated by the time and place of pest infestation. This is especially true with pests that attack the plant above ground just before the entry of agricultural machinery and crop treatment. One example of this complexity is the corn rootworm beetles that attack maize during tasseling stage when treatment is impossible without special machines or aerial spraying, which is rarely permitted. Adults damage the leaf, silk, tassel and subsequently the formed grains. The control of adults is often necessary especially in seed production. Various contact insecticides of different groups are permitted for use. In this work we used pyrethroid group of insecticides (Karate 2.5 EC), organophosphorus (Lebaycid EC 50) and combinations of representatives of the two groups (Chromorel D 50). The experiment was carried out in the field with a single treatment of adults and the time of maximum abundance. The total number of adults in the experimental plots was monitored. The results show a good efficiency of all three insecticides used in relation to the control untreated seed.