Gyrka T. Click beetles (Elateridae) on a corn and measures of limitation their harmfulness in North Steppe of Ukraine

Objects of the investigation are: click beetles, elements of corn growing technology: hybrids, methods of harvesting the predecessor and basic soil tillage, sowing terms, pre-sowing seed treatment and other. The aim of the research is to improve the system of corn plants defence on the early stages of ontogenesis from the larvae of click beetles on the basis of studiing the influencing of elements of corn growing technology on a quantity and harmfulness of wireworms. Used methods are: supervision, comparative, calculative and mathematic-statistical method. Scientific novelty is that in the conditions of North Steppe of Ukraine specific composition of phitophagous of corn shoots, among which especially harmful is click beetles, is specified. The particularities of biology of dominant species and dynamics of click beetles quantity are specified depending on non-biotical and biotical factors. The role of agrotechnical receptions of corn growing is studied in limitation of quantity and harmfulness of click beetles larvae. It is marked, that abandonment of predecessor straw (winter wheat) with the subsequent application of the deep ploughing diminishes damaged of corn by the click beetles larvae. Efficiency of mixture of insecticide of Gaucho (3,0 kg per tons), fungicide of Vitavaks (2,5 l per tons) and complexonate of microfertilizers of Reakom (3,0 l per tons) against wireworms and their influence is set on growth and development of cornplants. The branch is agriculture, plant protection