Mesa County expands Japanese beetle treatments across Grand Junction area as staff push for higher consent and longer-term funding

Mesa County officials updated city and county leaders on their third year of Japanese beetle treatments and urged broad cooperation to contain an infestation first detected in 2022 in the northern Grand Junction area.

"Japanese beetle was discovered in North Grand Junction in 2022," Natural Resources Director Amber Martinez told the workshop, describing a stepped-up eradication effort that expanded treated acreage to about 3,900 acres in 2025. Martinez said county crews and contractors are door-knocking about 4,000 properties and noted that some homeowners do not consent to treatments, which complicates eradication efforts.

Martinez outlined the county's approach: paired spring and fall treatments, monthly coordination with city staff and partners, outreach to HOAs and developers, and volunteer recruitment to help with trapping and monitoring. She said district schools and the city will be treating certain sites and that the county is pursuing infrared flyovers and GIS mapping to better locate turf areas most at risk.

On costs, Martinez said the county's three-year response has exceeded $500,000 and that a spring contract brought before the board would be about $300,000; she said a supplemental request later in the year is possible depending on consents and scheduling. Martinez also said the county and partners are using Acelepryn for treatments but that manufacturer pricing limits bulk-savings; staff said they are exploring other labeled and off-label options to lower future costs.

Elected officials pressed staff on the threshold for mandatory action versus voluntary programs. County and city staff noted that municipal authority can allow treatment without individual consent within city limits, while county authority differs; participants pointed to Palisade's established pest district as a model that allowed treatment without repeated individual consents and suggested a similar structure might be warranted for broader areas.

What happens next: staff will continue door-to-door outreach, pursue developer and planning-department coordination, consider additional mapping/flyovers and return to the board with contract details and any supplemental funding requests.

Sources: Presentation and Q&A at the Mesa County / Grand Junction joint workshop (transcript segments SEG 2000'SEG 2376).