Japanese beetle discovery in La Grande sparks Union County trap effort
A single Japanese beetle in La Grande has put Union County on containment watch, and state crews want residents to host traps before the pest spreads.
A single Japanese beetle found in La Grande has pushed Union County into an early containment effort, with the Oregon Department of Agriculture and Oregon State University Extension asking residents to host traps before the pest can work its way into gardens, orchards and field crops.
The discovery mattered because Japanese beetles can damage more than 300 plant species, including berries, fruit trees, vegetables, lawns and ornamentals. In Union County, that puts home landscapes, nurseries, orchards and other growing operations at risk if the beetle gains a foothold. The state’s concern is not just the insect itself but the cost of missing it early, when a small outbreak is still manageable.
ODA plans a larger survey in 2026 and wants about 500 traps placed. The traps are small green plastic units, about 12 inches tall, with a funnel and catch can. They use a pheromone and floral lure, are non-toxic and contain no insecticides. Officials want residents to allow traps on their property and to report any suspect beetles so specimens can be preserved for identification when possible.
The beetle found in La Grande in 2025 was the first ever discovered in Eastern Oregon, a sign that the pest has moved farther east than state officials want to see. ODA has been monitoring for Japanese beetles for more than 35 years, but the insect has appeared in Oregon multiple times since the 1980s. A major infestation in northwest Portland in 2016 produced 369 trapped beetles, and more than two-thirds came from just three traps near about 150 traps in the area, suggesting a breeding population had already been there for more than a year.
The agency says timing matters. Treatment applications in affected areas are expected to begin as early as mid-April, with trap placement in late April to early May, while surveys elsewhere in Oregon run from early spring through the end of September. ODA trapped 1,918 Japanese beetles statewide in 2025, most of them at a single property in Washington County. That work cut beetle numbers by 65% from the previous year and by 92% since 2016.
Funding now underpins the response. Oregon House Bill 5204 allocated $1.8 million to continue the Japanese beetle program over the 2026 and 2027 crop years after the 2025 Legislature did not approve funding. ODA says Oregon could lose active pest-free management status if the program lapses, which could trigger quarantine requirements from other western states and complicate shipments from Oregon nurseries and Christmas tree operations. Oregon State University’s hazelnut program has also warned that an ODA economic risk analysis estimated possible damage to specialty crops at about $35 million a year, before accounting for hazelnuts and inflation.
For Union County, the message is plain: the beetle is small, but the stakes are not. Fast detection now could spare La Grande and surrounding growers from a broader infestation that would be far more expensive to control later.
Know something we missed? Have a correction or additional information?
Submit a Tip
