Grapholita molesta and Bonagota cranaodes are two key pests in apple orchards controlled by insecticides. The objective of the present study was to test two formulas of Bacillus thuringiensis var. kurstaki to control these tortricid moths. Plot of 'Fuji' apple trees were sprayed with Dipel PM and Dipel SC, at a concentration of 100ml por 100 l liquid. The efficiency of Btk was compared with the insecticides tebuphenozide (Mimic 240 SC - 90 ml por 100 L) and chlorpyrifos (Lorsban 480 BR - 150 ml por 100 L). The capture of pests in a Delta-type trap was assessed twice a week. Fruit damage was evaluated pre- and post- harvest and the fruit were classified by branch-end clustering and location on the plant. The treatments with B. thuringiensis were more damaged than those with chemical treatments. There tended to be more damage in the internal part, close to the apple tree trunk and the fruit clustering did not influence damage occurrence. Both Dipel formulations was efficient in relation of Mimic and Lorsban.
Grapholita molesta; Bonagota cranaodes; apple tree; Bacillus
