Underestimated Damage Caused by the European Hazelnut Weevil, Curculio nucum (Curculionidae)

Hazelnut is an important food resource for the larvae and adults of hazelnut weevil, Curculio nucum. While wormy nuts reflect impact such weevils at harvest time, little known about other types damage they cause. To establish a comprehensive list damages, thereby identify period vulnerability, male female were collected weekly isolated on fruiting branches 1 week. Based nut development, higher rates dropped nutlets, belted nuts, blank observed harvest. Marks specific to weevils, including riddled shells, paths basal scar, recorded during lignification. Belted are empty constituted main damage. The feeding activities both larvae, but also oviposition punctures, likely be causes embryo abortions. greatest damages occurred kernel growth when shell had almost reached its final size. failed penetrate fully lignified with dead mainly being found later softer part hazelnut. In Ségorbe cultivars, dynamic development factor involved in susceptibility C. nucum, aborted most underestimated