Neochetina eichhorniae (weed bioagent)

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Neochetina eichhorniae feeding on Eichhornia crassipes (click on image to enlarge it)
Author(s): Willey Durden, USDA Agricultural Research Service
Source: IPM Images

Neochetina eichhorniae (weed bioagent) Warner, 1970

This semiaquatic weevil is native to southern parts of South America. It is very similar in appearance and biology to Neochetina bruchi but slightly smaller (♀ 3½-4 mm, ♂ 3-3½ mm). Both species have been released in North America in the 1970s (and subsequently in various other countries) against the invasive water hyacinth (Eichhornia crassipes).

N. eichhorniae has become established in most release areas and is considered to be effective in suppressing the weed. However in California where N. eichhorniae and N. bruchi have been released (1982-1987) and became established, a survey in 2002 only found N. bruchi (Akers et al., 2017).