UF/IFAS study: Mite might control pest that attacks Florida’s $125 million-a-year cucumber crop

IFAS Extention faculty are working to increase food safety. By following food safety guidelines, farmers and packing facilities are improving their processes, but consumers must be aware of how to select, store and serve fresh produce in order to minimize their risk of contracting food-borne illnesses. UF/IFAS Photo: Thomas Wright.

GAINESVILLE, Fla. — A predatory mite might feed on a pest of cucumbers, a $125 million-a-year crop in Florida, newly published University of Florida Institute of Food and Agricultural Sciences research shows.

This finding may help growers protect the environment because they could reduce pesticides to keep the pest – known as thrips — at bay. Growers may also save money because they may cut chemical use on their crop. In fact, because this thrips preys on many vegetable crops, the finding could save millions of dollars in pesticide use.

Armed with new data, it’s important for growers to use the mite to mitigate the pest, UF/IFAS researchers said.

“It will take some time for growers to be trained to use biological control agents in the field for maximum benefits,” said Garima Kakkar, who spearheaded the study as part of her master’s thesis when she was a graduate student at the UF/IFAS Tropical Research and Education Center in Homestead, Florida.

For the study, published in the journal Biological Control, UF/IFAS researchers conducted a trial to investigate if certain mites would control the pest known as Thrips palmi, which poses a serious threat to cucumbers and other vegetable crops in South Florida.

Kakkar reviewed the mites known as Amblyseius swirskii and Neoseiulus cucumeris to see if they could control the thrips and keep them from harming cucumbers in a laboratory, a field and in a shade house. She found A. swirskii effectively controlled T.palmi, also known as melon thrips.

In fact, A. swirskii can control many thrips and other pests including whiteflies, broad mites and spider mites on a number of crops in addition to cucumbers, said Kakkar, now a post-doctoral research associate at the UF/IFAS Mid-Florida Research and Education Center in Apopka, Florida.

Kakkar’s findings are critical for Florida’s large cucumber industry. With 22,700 acres – including fresh and pickled cucumbers — and 22 percent of the United States’ production, cucumbers are valuable to Florida’s economy, according to UF/IFAS reports. At $125 million, Florida accounts for 37 percent of the national market value of cucumbers.

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Caption: UF/IFAS scientists, led by post-doctoral researcher Garima Kakkar, have found a mite that will eat a type of thrips — a pest that preys on cucumbers. That’s good news for Florida’s $125 million-a-year cucumber industry. It can save growers millions of dollars in chemicals that would otherwise be used to control the pest.

Credit: UF/IFAS file

By: Brad Buck, 352-294-3303, bradbuck@ufl.edu

Sources: Garima Kakkar, garimaiari@ufl.edu

Dakshina Seal, 786-217-9269, dseal3@ufl.edu