engleski

BIOBIT XL (Bacillus thuringiensis Berliner subsp. kurstaki) IN CONTROLING ECB (Ostrinia nubilalis Hübner) ON CORN IN EAST CROATIA

Corn is grown in Croatia on 400 000 ha, and average yield is 4,5 t/ha. The majority of cornfields are settled in eastern part of Croatia. European corn borer (Ostrinia nubilalis Hňbner) is constantly present pest at our cornfield. Intensity of attack of ECB in last 3 years was 42,75% in average. Here is important to stress that 40% of corn production is in monoculture. This study showed differences in attack intensity of ECB between untreated plots and plots treated with Biobit XL (3 l/ha) – the preparation on the base of Bacillus thuringiensis Berliner subsp. kurstaki. Controlling was done in 1995 year on silage corn (hybrids Marista and Stira) and 1997 on grain corn (hybrid Decalb). On silage corn, attack intensity on control plots was 100%, while on treated plots it was 59%. Hybrid Decalb, sown in monoculture, had 83% attack intensity in control plots and 35% on treated plots. On silage corn, 1,61 tunnels and 1,79 larvae per plant was determined on control plots and 0,64 tunnels and 0,01 larvae per plant on treated plots. On grain corn 2,01 tunnels and 0,4 larvae per plant was determined on control plots and 0,54 tunnels and 0,01 larvae on treated plots. Average length of damage on both treatments was 3,5 cm per plant on control plots and 1,02 cm on treated plots. Grain yield on Decalb hybrid was 32% higher on treated than on untreated plots. Controlling of ECB with Biobit XL showed good results, better yield, lower number of tunnels and larvae, lower length of damage, and it could be applied in integrated pest management.

corn; biological control; Bacillus thuringiensis Berliner

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