Delta County Mosquito Control District 1 is asking growers, processors and storers of industrial hemp to notify them.
According to district manager Terry Stalcup, the pesticide used in fogging, one of the methods used to control mosquito populations, has not yet been approved by the Environmental Protection Agency for use with commercial hemp. The Colorado Department of Agriculture website has a list of 338 pesticides approved for use in cannabis production.
"We can go next to everything else like avocados, peaches and lettuce but use near hemp has not been approved yet," he said. "If you're growing commercial hemp, storing it, or have a processing facility you need to let us know."
The main issue identified by one grower is that the permethrin appears in CBD oil. While not harmful to humans it could impact labeling.
One challenge Stalcup identified that Mosquito Control will need to manage is that those living next to areas marked for hemp will also not receive fogging treatment.
The effective range for killing the mosquitoes with fogging is 300 feet, but Mosquito Control is currently unsure how far the chemicals can drift and affect the hemp plants. To be safe, they'll fog a significant distance from hemp until the information is clarified.
A list of industrial hemp registrants by county is available on the state website, but many addresses listed are for post office boxes. Stalcup said the board is planning a mass mailing.
Growers are being asked to contact Mosquito Control and then submit the map they already sent to the state outlining their growing or processing area.
To notify Mosquito Control, please call 970-874-4384.