The Idaho State Department of Agriculture has set up 3,000 traps in southwest Idaho and budgeted $400,000 to fight a Japanese beetle infestation.
Agency spokesman Lloyd Knight says the department is also treating areas with insecticides to prevent the beetles from multiplying.
The beetles attack more than 300 different ornamental and agricultural plants, as well as flowers and fruit.
The larvae are also destructive, feeding on grass roots and damaging lawns, golf courses and parks.
Japanese beetles started multiplying in the Boise area in 2011.