Texas — Researchers at Caddo Lake are hopeful a mat of the invasive giant salvinia that’s been choking the lake is turning brown because weevils they raised are doing their jobs.

Biologist Lee Eisenberg, of Texas A&M’s AgriLife Research and Extension Service, began growing giant salvinia weevils six years ago in hopes the only known predator of the invasive weed would eat a lake full of the harmful plant. 

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