Neochetina eichornia (Mottle Waterhyacinth Weevil) is herbivorous on the freshwater plant Water Hyacinth (Eichornia crassipes), It is native to South America. After research on its specificity, it and N. bruchi (Mottled Waterhyacinth Weevil) were released in 1972-1974 in Florida for biocontrol of the troublesome plant. In subsequent years, these insects were released in Alabama, Mississippi, Louisiana, Texas, and the Sacramento-San Joaquin Delta in California in 1981-1982 (Army Corps of Engineers 1999). These weevils have also been released in Mexico, India, China, Africa, Australia, and other countries where Water Hyacinth causes problems in waterways. Altogether, N. eichorniae has been introduced in at least 14 countries and become established in 23, as of 2000. In the San Francisco Delta, N. eichorniae did not become established. In Florida and the Gulf states, it was regarded as more effective for biocontrol than N. bruchi. The weevils feed on the exterior of the leaves causing scars and reducing photosynthesis. In other locations, such as Florida and Louisiana, the weevils have reduced the Water Hyacinth biomass enough to reduce the need for herbicides or mechanical control. The biocontrol program is regarded as a qualified success (Shelton 2024). https://biocontrol.entomology.cornell.edu/weedfeed/Neochetina.php