Hickory nut weevil

Systematic position: The hickory nut weevil (Conotrachelus affinis) belongs to the order Coleoptera and the family Curculionidae. It is a significant pest primarily associated with trees of the genus Carya, specifically affecting the nuts of hickory and pecan species.

Host plants: The primary hosts for this insect are various species of hickory (Carya spp.) and the commercially important pecan (Carya illinoinensis). It is a major concern for nut orchard owners who cultivate these specific botanical varieties.

Biology and life cycle: Adult weevils overwinter in the soil. In the spring and early summer, they emerge to feed on developing foliage and nutlets. The female weevil drills a hole into the young nut to deposit her eggs. Once hatched, the larvae feed internally on the developing nut kernel, maturing inside the shell before emerging to pupate in the soil.

Damage and economic impact: The larvae cause severe damage by consuming the nut meat entirely. Infested nuts typically drop from the tree prematurely. The presence of small, circular exit holes on the shell is a definitive sign of infestation, rendering the nuts unsalable and unsuitable for processing.

• Sanitation: Regularly collect and destroy all fallen nuts to remove larvae before they enter the soil.
• Soil cultivation: Tilling the area beneath the tree canopy can help disrupt the pupation process.
• Monitoring: Use trapping methods or visual inspection during the early growth stages to track weevil activity.
• Chemical control: Apply appropriate insecticides targeted at the adult weevils before they lay their eggs.
• Orchard maintenance: Ensure optimal tree health through proper fertilization and pruning to reduce stress and susceptibility.