About harmful action of flea beetles in cabbage agrocenosis during of the trap-crop usage

In forest-steppe zone of Priob'e the author investigates the harmful action and spatio-temporal distribution of flea beetles on cabbage crops during of use of Brassica juncea sowing as trap-crop. It was shown, that at the seedlings rootage period the flea beetles density is decreased in area of 250 m around trap-crop. At the same time the harmful of flea beetles do not reaches of economically valuable level.