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S.C. Oks Pesticides for Hemp Crops

CLEMSON — The South Carolina Department of Pesticide Regulation (DPR) has approved a list of pesticides for use on hemp crops, removing a hurdle farmers have faced since the crop was cleared for production in the state earlier this year.

Both federal and state law have been amended in the past six months to allow licensed production of industrial hemp, a strain of the same plant as marijuana but without its intoxicating effects. The S.C. Department of Agriculture has approved 114 growers for the state Hemp Farming Program for 2019, however, no pesticides have yet been labeled for use on the crop.

“We don’t want to be in a conundrum where we have growers who have no pesticides to use,” said Tim Drake, DPR State Programs manager. “We’re already seeing samples of young hemp plants with cutworm damage. These are expensive plants. When you’re paying $4 for a plant you can’t afford to lose too many of them.”

The pesticides DPR approved were first adopted for the crop in the state of Washington, which has a history of hemp production. All are classified as 25(b) pesticides under the Federal Insecticide, Fungicide and Rodenticide Act, meaning the U.S. Environmental Protection Agency considers them minimum-risk pesticides.

Drake cautions, though, that not all the pesticides on the list are currently registered for use in South Carolina.

The list is being distributed to Clemson Extension Service agents in counties where the more than 100 licensed hemp farmers in South Carolina reside. Extension agents help farmers adopt best practices is the production of a wide array of crops.

The approved list is a temporary measure adopted to help farmers who are licensed to grow industrial hemp until federal regulations are created. The U.S. Department of Agriculture is expected to issue production regulations by the end of the year. There currently are no EPA-registered pesticides labeled specifically for hemp.

“There are a lot of misconceptions,” said Katie Moore, a Clemson Extension associate with the university’s Pesticide Safety Education Program. “I think many people are under the impression that organic pesticides can be used on hemp. Just because it is organic doesn’t mean it is allowed. It must be labeled for herb crops. You need to read and follow the label.”

Hemp and its cousin, marijuana, are both strains of the Cannabis sativa plant species. They are distinguished by their fiber content and chemistry.

Hemp is more dense in fiber. It also has much lower concentrations of tetrahydrocannabinol, or THC, the psychoactive substance for which marijuana is known.

By law, industrial hemp must have less than 0.3 percent THC, while marijuana may contain between 10 and 100 times that concentration. By contrast, hemp has higher concentrations of cannabidiol, or CBD, which does not have the same psychoactive effects as THC but is approved by the Food and Drug Administration for use controlling epileptic seizures.

Industrial hemp is grown for its fiber and seeds. The strength of hemp fiber makes it valuable in products from textiles to rope. Its seeds can be processed as a food additive or crushed for their oil.

The end use of the product — whether it is grown for its fiber or as a food or oil crop — is a crucial factor in pesticide selection.

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