Throughout the State of NSW, the codling moth (Cydia pontonella) is a serious pest of apples, pears and quinces.The spring brood moths commence to emerge early in October, reaching a peak about mid-November.

Eggs are laid on leaves and fruit, and hatch in five to ten days, the young caterpillars soon eating into the fruit. These larva become fully-fed in about four weeks, crawl from the fruit down to shelter under loose bark and in crevices around the trunk and main limbs, and there spin cocoons in which they enter their pupal stage.

The earliest of these caterpillars become pupa during the first week in December, and others throughout December and January. After about fifteen days these pupae change into moths which appear from about mid-December to March, reaching a peak in late January. The fully-fed caterpillars, arising from this second brood of moths, remain within their cocoons during the winter. About mid-September they change into pupa, and later, give rise to the spring generation of moths. Some second brood caterpillars may enter their pupal stage and give rise to a partial third brood of moths, the caterpillars of which may infest the fruit of late varieties in April.