Polishvajko M. Biological substantiation of protection measures of sugar beets against beet flea beetles under conditions of Central Forest-Steppe zone of Ukraine

The species composition, biological features and seasonal dynamics of quantity of the beet flea beetles are specified nowadays. Among those Сhaetocnema соncinna Marsh., dominated, a part of which in the accounts made up 95 % of above mentioned. The evaluation of 30 stability modern varieties and biotypes of sugar beet to beet flea beetles is carried out. To find out essential reduction of injuring of plants was not possible during the experiment. The influence of agrotechnical measures on injury of sugar beet by flea beetles is investigated. An after-action of different doses of fertilizings has not caused decrease injuring of plants by these pests. The effectiveness of action of insecticides for treatment of seeds and spraying of sugar beet against these pests has been investigated. The greatest effectiveness of action against flea beetles in a phase "1-st pair of leaves " (75 %) was supplied with Gaucho, 70 % w.p. While spraying plants of sugar beet, the greatest effectiveness of action against flea beetles was received on plots with a Parachute 450, 45 % s.e., which on the 7-th day after spraying made up 60 %.