Clover root weevil (Sitona lepidus) was first identified in New Zealand around 1996. It spread initially through Waikato, Bay of Plenty and Northland. By 2004 CRW had been found on dairy farms throughout the North Island.
The CRW adult is a small speckled brown weevil up to 6mm long found in the base of pasture throughout the year. Numbers vary seasonally with lows in winter and summer, and highest population densities in spring and autumn. When feeding, the adult makes characteristic U shaped notches on the edge of the clover leaf.