ATTRACTIVENESS OF POTATO VARIETIES FOR COLORADO POTATO BEETLE AND APPLICATION OF CATCHING BEDDING IN ORDER TO PROTECT THE CROP FROM THE BLAST IN THE FOREST-STEPPE OF THE OB REGION
The article explores 15 varieties and highlights 5 of them (Adretta, Zhukovsky ranniy, Svitanok kievsky, Nikita and Scarlet) that are less attractivefor Colorado potato beetle. Experimental research of testing the attractive variety Lene as a catching bedding while growing less attractive Adretta cultivar has shown that the Colorado potato beetle did not occupy Adretta whereas the Lene cultivar was covered with the Colorado potato beetle during the whole vegetation period. The researchers found out that overwinter imagos ate the attractive Lene cultivar (0.3 beetles pro a plant). This tendency was observed in concern of oviposition and the number of larvae. The number of larvae on the Lene plants was higher than the permissible rate. The authors outline 85 % efficiency of spraying the plants with specimens Decis Profy. The crop yield of less attractive Adretta cultivar was 10.2 t/ha была 10,2 whereas the crop yield of attractive Lene cultivar was 9.0 t/ha, i. e. 12 % less. Combined growing of cultivars different in their attractiveness is more efficient for the Colorado potato beetle as this allows to apply insecticide on the cultivar which is attractive for Colorado potato beetle. This reduces costs for buying and application. The profit from growing Adretta cultivar, less attractive for Colorado potato beetle, was 54.8 thosands of RUR/ha whereas it was 46 thousands RUR/ha for the attractive Lene cultivar.