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Invasive pest has met his match

A pest with a voracious appetite may have met its match in a predatory mite being evaluated as a biocontrol agent by Agricultural Research Service scientists in Fort Pierce, Fla., in collaboration with University of Florida researchers.

The chilli thrips is an invasive pest that feeds on leaves, turns them brown, kills new growth and attacks up to 150 crops, including peppers, strawberries, tomatoes, peanuts, cotton and a variety of ornamentals.

Detected in Palm Beach County, Fla., in 2005, it has spread to 24 Florida counties and parts of Texas, damaging roses and other ornamentals in both states. Left unchecked, it could reach west to California and north along the Pacific Coast to Canada, causing losses of up to $3.8 billion annually.

Pesticides are effective, but the chilli thrips may develop resistance with repeated treatments, and pesticides are not an option for organic nurseries and gardeners, according to entomologist Cindy L. McKenzie, at the ARS U.S. Horticultural Research Laboratory in Fort Pierce.

Researchers at Fort Pierce and the University of Florida have turned to two mites, Neoseiulus cucumeris and Amblyseius swirskii, which have been used commercially to combat other pests since at least 2005.

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