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Scientists release biocontrol for water hyacinth

May 18, 2010
USDA/Agricultural Research Service
A new insect that will help control the invasive weed, water hyacinth, has been released by agricultural scientists and cooperators.

This tiny insect, Megamelus scutellaris, has been released as a biocontrol for the invasive weed waterhyacinth, which has become a major problem in southeastern waterways.
Credit: Photo courtesy of Philip Tipping, ARS

A new insect that will help control the invasive weed waterhyacinth has been released by Agricultural Research Service (ARS) scientists and cooperators.

Waterhyacinth (Eichhornia crassipes) is a free-floating aquatic plant native to South America that has infested freshwater ecosystems from North Carolina to California but is especially problematic in the southeastern United States. The plant is a real menace, affecting water traffic, water quality, infrastructure for pumping and hydroelectric operations, water use and biodiversity. Other problems include fish kills due to low oxygen levels and increases in populations of vectors of human and animal diseases.

ARS entomologists Philip Tipping and Ted Center, both with the agency's Invasive Plant Research Laboratory (IPRL) in Ft. Lauderdale, Fla., worked closely with scientists at the ARS South American Biological Control Laboratory (SABCL) in Buenos Aires, Argentina, to find and test Megamelus scutellaris, a new biocontrol for waterhyacinth.

M. scutellaris is a small planthopper native to South America whose nymphs and adults feed on the sap of waterhyacinth. Nymphs are active and readily hop, even off the surface of the water. The insect's population increases rapidly, which will enable it to quickly impact the waterhyacinth population.

Herbicides are the primary method for reducing waterhyacinth, but their use directly interferes with the biocontrol agents currently deployed against this weed. The scientists believe M. scutellaris may integrate better with existing herbicide programs because of its mobility, which should improve its survival in such highly managed systems.

The researchers collected adults of M. scutellaris from Argentina in April 2006 and brought them to the quarantine facility in Ft. Lauderdale where extensive host-range studies were conducted. They found that the planthopper is highly host-specific and does not pose a threat to native or economically important species.

Tipping and Center joined representatives from the Florida Fish and Wildlife Conservation Commission, which provided more than $300,000 in financial support for the project, and the U.S. Army Corps of Engineers at an event celebrating the insect's release at the Edgefield Regional Stormwater Treatment Facility owned by the St. Johns River Water Management District near Palatka, Fla.

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Materials provided by USDA/Agricultural Research Service. Original written by Stephanie Yao. Note: Content may be edited for style and length.

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USDA/Agricultural Research Service. "Scientists release biocontrol for water hyacinth." ScienceDaily. ScienceDaily, 18 May 2010. <>.
USDA/Agricultural Research Service. (2010, May 18). Scientists release biocontrol for water hyacinth. ScienceDaily. Retrieved May 23, 2017 from
USDA/Agricultural Research Service. "Scientists release biocontrol for water hyacinth." ScienceDaily. (accessed May 23, 2017).