Marija IVEZIC and Emilija RASPUDIC
University of J. J. Strossmayer in Osijek, Faculty of Agriculture in Osijek, Croatia

European Corn Borer (Ostrinia nubilalis Hübner) is one of the most important pests on corn in Croatia. Corn production was on over 400 000 ha, in last decade, in east Croatia. Although, ECB is present every year, with no such a low intensity, their control is not implemented. Corn is sown as a monoculture, at 40% of cornfields, which also has influence on spreading of ECB. In the last ten years average attack of ECB was 51,5%. In last ten years, in Eastern Croatia, it has been done three different kinds of experimental trials for controlling ECB. First trials were carried out on Decalb hybrid, and ECB was controlled by Biobit XL, on the base of Bacillus thuringiensis Berliner. Intensity of attack decreased for 46%. Second trial was carried out on ten hybrids, in order to determine the tolerance of hybrids against ECB. This investigation identified several domestic hybrids (OSSK 382, OSSK 664 and BC 462) as tolerant to ECB. The third trial was carried out with GM hybrids. In experiments were Pioneer hybrids Evelina Bt, and Landia Bt. Intensity of attach at Evelina standard was 52%, while in Evelina Bt, ECB wasn't present at all. At Landia standard ECB was present on 98%, while in Landia Bt, intensity of attack was 21%. At both Bt hybrids number of larvae and tunnels was lower in compare to standard hybrids. Length of damage on Landia standard was 20,66 cm, while on Landia Bt, it was 0,45 cm. The yield increased for 10,27% at Evelina Bt, and for 26,67% in Landia Bt in comparing to their standards. This kind of experiments will be continued in the future, not only because of their advantages, but also because of their possible side affects in nature.