Research Highlights Use of Biocontrols to Manage Chilli Thrips
January 12, 2022 
Chilli thrips damage in strawberries; Photo: University of Florida
University of Florida (UF) scientists have found a way to better control the chilli thrips that can make strawberries virtually unmarketable – and it means using less pesticides.
Florida growers produce about 11,000 acres of the fruit each season. With the new, biological control method, farmers could save up to 5,000 gallons a year in pesticides that would otherwise be used on the crop, says Sriyanka Lahiri, a UF/Institute of Food and Agricultural Sciences (IFAS) Assistant Professor of Entomology.
While pesticides kill thrips, they also can destroy predatory mites, pollinators, and other beneficial insects, which can result in a pest resurgence and thus, less fruit yield. As a substitute for pesticides, Lahiri’s new research points toward using mites to control the thrips.
In recent years, chilli thrips has caused significant economic damage to strawberries. It feeds on plant tissues and reduces fruit size, leaving growers with far fewer strawberries to sell.
In newly published research, UF/IFAS entomologists found that a biopesticide and the predatory mite Amblyseius swirskii can more effectively control chilli thrips than using traditional pesticides. With the treatments, scientists saw little damage to the strawberries.
Specifically, Lahiri, a faculty member at the Gulf Coast Research and Education Center, put thrips on a UF/IFAS-bred ‘Florida Radiance’ strawberry plant. Then, she sprayed the biopesticide and added predatory mites and saw less fruit damage because the biopesticide and mites eliminated most of the thrips.
“This is especially relevant for organic strawberry production, because there are very few effective tools to manage thrips that are also certified to be used in organic production,” Lahiri says. About 10% of the strawberries cultivated in Florida are organic.
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