Sitona hispidulus

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Sitona hispidulus (click on image to enlarge it)
Author(s): Tom Murray
Source: BugGuide

Sitona hispidulus (Fabricius, 1776) - (clover root curculio)

This weevil is native to Europe and to temperate parts of Asia. It has been recorded in North America since 1875 and is now widely distributed there. S. hispidulus attacks the roots of alfalfa and clover and has become an important pest of these crops in North America.

The adults are around 4 mm long. Typically, they emerge during the summer, feed on the foliage and start egg laying in autumn. Feeding and egg-laying may continue over the winter, or is interrupted in cooler areas for overwintering and resumes in spring. Most of the damage is done by the larvae which feed first on the nitrogen-fixing root nodules, then on the remainder of the roots.

Vernacular names
• English: clover root curculio
• Français: charançon des racines du trèfle

For a review see Rim et al. (2019).