APPLICATION OF DIFFERENT INSECTICIDES BY DRIP IRRIGATION METHOD AGAINST EUROPEAN CORN BORER ON CORN CROPS

The peculiarities of the development and dynamics of the population density of European corn borer (ECB) on corn crops under irrigation were studied in 2019–2021 in conditions of Steppe of Ukraine. Field investigations were conducted according to generally accepted methods. The size of the experimental plots in the field experiments was 50 m (10.4 x 4.8 m), the replication was 4 times. Allocation of plots was randomized. The beginning of the first adults flight was observed in the 1st decade – in the middle of June at average. Mass laying of eggs and the flight of more than 50% of the butterfly population occurred in the 3 decade of June, which coincided with the phase of pollen shedding of corn plants. Mass flight of the butterfly (flight of more than 75% of the population) was observed at the end of the 3 decade of June – the beginning of the 1st decade of July. The revival of caterpillars began in the third decade of June and continued until the end of July. The average population density of European corn borer caterpillars in 2019–2021 were 1.6 and 1.8 specimens per stem on corn crops. The European corn borer is a dangerous pest of corn in the Steppe zone of Ukraine, where it’s caterpillars damage 34.5–37.8% stems and ears of this crop. Application of Coragen 20 KS, Calypso 480 SC and Actara 25 WG at higher from recommended rates against the ECB contributed to the reduction of plants damage in 8–15 times, compared to untreated crops.