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A global trend of intensive rapeseed production as a sustainable source of energy has also been accepted in our region, but intensified production results have increased pest populations in that crop. Central European countries with a long tradition of rapeseed production have ample data on pest biology, control and effects of insecticide applications, but such data are almost nonexistant under our regional conditions. In the light of this fact, the objective of our study was to determine the optimal time for insecticide applications for controlling pest species of the genus Ceuthorrynchus. Trials were set up using standard OEPP methods with certain adaptations concerning the pest species. The insecticides based on chlorpyrifos + bifenthrin, applied at the rates of 0.5 l/ha and 0.75 l/ha, and deltamethrin at 0.3 l/ha, were applied a) once - at maximum abundance of adults, and b) twice - first at maximum abundance, and then eight days later. The trials were set up at two localities - Kac and Kovilj. Insecticide effects were evaluated based on the number of adults per 20 plants, the number of damaged plants and the number of larvae per plant. After single application of the insecticides chlorpyrifos + bifenthrin (0.5 and 0.75 l/ha) and deltamethrin (0.3 l/ha) in the locality of Kac, the percentage of infested plants was 1.25%, 36% and 75% (respectively), and 95% in untreated plots; while 75% and 22.5% of the plants were infested in the locality of Kovilj after chlorpyrifos + bifenthrin application, 95% after deltamethrin application, and 97.5% in untreated plots. Insecticide effect estimated by the number of larvae/plant was 0 and 0.4 for chlorpyrifos + bifenthrin, 1.4 for deltamethrin and 3.3 for untreated surface in the locality of Kac; while in the locality of Kovilj the effect of chlorpyrifos + bifenthrin was 1.4 and 0.1, deltamethrin 3.9, and 5.2 larvae/plant in untreated plots. After two insecticide applications in Kac, the percentage of infested plants was 13.7% and 16.2% after chlorpyrifos + bifenthrin treatment, 62.5% after deltamethrin and 95% in untreated plots. In Kovilj, the percentage of infested plants was 22% and 17% after the application of chlorpyrifos + bifenthrin, 79% after deltamethrin, and 97.5% on untreated surface. The insecticide effect shown by the number of larvae/plant was 0.12 and 0.13 for chlorpyrifos + bifenthrin, 1.7 for deltamethrin and 3.3 on untreated surface in the locality of Kac. In Kovilj, the corresponding data were 0.16 and 0.08 for chlorpyrifos + bifenthrin, 1.4 for deltamethrin and 5.2 larvae/plant for the untreated surface.

Problems in Ceuthorrhynchus spp. Control on rapeseed in the region of Serbia