Oregon flags potential problem with popular pesticide used on marijuana

The Oregon Department of Agriculture on Friday temporarily removed a popular pesticide from its list of chemicals cannabis growers may use on their crop.

Rodger Voelker, a chemist with OG Analytical, a marijuana testing lab in Eugene, said he recently noticed that abamectin, a common insecticide, had turned up in a handful of cannabis samples submitted by growers who said they grew organically. One mentioned he used only Guardian Mite Spray. Voelker asked for a sample of the mite spray, tested it and detected abamectin, an active ingredient not listed on the product label.

Voelker alerted agriculture officials about his results on Thursday since the mite spray is included on the state's newly released list of pesticides growers may be able to use on their plants. The product is marketed as an all natural pesticide containing products like cinnamon oil and lemon grass oil.

The state on Friday issued a...

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