Consult the labels for dosage rates and safety precautions. Adult emergence can be monitored with yellow sticky traps. Quince curculio , Conotrachelus crataegi. This pest spends the winter in the soil, as larvae that form pupae in spring. The adults appear in midsummer, usually about the middle of July.
Females lay eggs singly in fruit.
After the eggs hatch 7-10 days later, the larvae tunnel into the flesh of the fruits, rarely reaching the core. Curculios injure pears in a different way than they damage quinces. In pears, single larvae reside in a cavity between the skin and the core. On the outside of the fruit is a flattened and hardened area with a puncture in the center. Despite this injury, the fruit is not especially knotty or deformed.