description Nut Weevil Overview
The nut weevil refers to various species of beetles in the genus Curculio that act as widespread agricultural pests of hazelnuts and chestnuts. These insects are physically characterized by their elongated snouts, known as rostrums. Females use these long rostrums to chew holes into developing nuts, where they deposit their eggs. When the larvae hatch, they feed on the nut's interior, often causing significant crop damage before dropping to the ground to pupate.
help Nut Weevil FAQ
Why do hazelnuts damaged by nut weevils have round holes?
The larva feeds inside the developing kernel and later chews a circular exit hole through the hardened shell. It then drops to the soil, where it pupates and completes its development.
How does a female nut weevil lay an egg inside a nut?
She uses her elongated rostrum to drill through the soft shell of a developing hazelnut or chestnut. After making the channel, she deposits an egg so the hatching larva can feed on the kernel.
Can you eat a hazelnut after a nut weevil has used it?
An infested nut is usually hollowed, contaminated, or occupied by a cream-colored larva, so it should be discarded. A visible exit hole means the larva has already consumed much of the kernel and left.
How can gardeners interrupt the nut weevil life cycle?
Collecting and destroying fallen infested nuts prevents many larvae from entering the ground. Because species such as Curculio nucum spend part of their life in soil, cultivation or poultry foraging beneath host trees can also expose developing stages.
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