Page Banner

United States Department of Agriculture

Agricultural Research Service

Seductive Beetle Dines on Fruit Weed / January 22, 2002 / News from the USDA Agricultural Research Service

Agricultural Research Service
U.S. Department of Agriculture
ARS News and Information Search News and Info Science for Kids Image Gallery Agricultural Research Magazine Publications and Newsletters News Archive News and Info home ARS News and Information
Latest news | Subscribe

Photo: The tortoise beetle, Gratiana boliviana, is being considered as a biocontrol agent for tropical soda apple. Link to photo information
Click image for caption and other photo information.

Read the magazine story to find out more.

Seductive Beetle Dines on Fruit Weed

By Rosalie Marion Bliss
January 22, 2002

A fruit-bearing weed is encroaching on some 1.5 million acres of pasture, crop and urban land in the southeastern United States. Cattle, deer and other wildlife enjoy snacking on the fruit produced by the tropical soda apple (TSA). But this weed proliferates when its seeds pass through the animals’ digestive tracts and are deposited as the animals browse. Soon after, TSA takes over precious farmland.

Agricultural Research Service scientists led by Daniel Gandolfo with the South American Biological Control Laboratory in Buenos Aires, Argentina, may have found a way to halt TSA’s dramatic spread. It seems both the larval and adult stages of a prolific beetle, Gratiana boliviana, enjoy chewing the weed to death.

The six-millimeter-long beetle, commonly known as the tortoise beetle, reproduces rapidly, attracting and seducing mates with an iridescent, turquoise-and-gold body.

Studies in Argentina and cooperative studies with University of Florida’s Julio Medal at quarantine facilities in Gainesville are helping pave the way for the beetle’s release to control TSA-infested lands. Scientists had to ensure G. boliviana would not devour important crops as well as the weed. To protect nontarget plants, extensive tests--using eggplant as a “guinea pig”--are being conducted to determine if G. boliviana could become a pest on farm crops if released to control TSA. Study results so far have eased this concern.

If, as anticipated, the beetle’s performance continues to confirm these findings, G. boliviana could be approved for release in the United States sometime in the next two years.

Read more about controlling TSA in the January issue of Agricultural Research magazine.

ARS is the chief scientific research agency in the U.S. Department of Agriculture.

Top | News Staff | Photo Staff

E-mail the web team Privacy and other policies Site map About ARS Information Staff Bottom menu

Home | News | Pubs | Magazine | Photos | Sci4Kids | Search
About ARS Info | Site map | Policies | E-mail us

Last Modified: 3/5/2002
Footer Content Back to Top of Page