When development is completed, it leaves the fruit and weaves a cocoon in a sheltered spot. The caterpillars that become fully fed from August to October all enter diapause. They overwinter in cocoons hidden in cracks in the tree-trunk or in a natural shelter on the soil. May. They mate and lay the eggs on leaves, twigs, or young fruits. The bite marks on the damaged fruit makes them impossible to sell.
Damaged fruit drops prematurely.
Late or seasonal varieties of pear are not very susceptible to the 1st generation because their epidermis is hard. Female at rest Preparing to lay on an apple leaf. Devouring the pips in the carpellary cavity.