Japanese Beetles (Popillia japonica) in Oregon
In 2018 Metro will send yard debris from quarantined areas to be disposed of rather than composted.
Oregon Department of Agriculture (ODA) has also pursued a strategy to isolate and dispose (rather than compost) yard debris, soil and roots from areas infested with Japanese Beetles. In 2018, the ODA has decided to expand both the treatment zone and the yard debris quarantine area. As a result, Metro staff expects that 4,000 to 5,000 tons of yard debris may be generated and disposed of during 2018.
In 2016, Japanese beetles were trapped in high numbers in the Portland area. The Oregon Department of Agriculture is working to eradicate Japanese beetle hot spots in Portland, and OSU Extension is helping with outreach, identification, and management information for this potential pest. This insect is a major plant pest that is destructive to approximately 300 species of turf, fruits, vegetables, shrubs, and trees.
Because of the highly visible damage Japanese beetles cause to turf and ornamentals, the overuse of chemical controls is a real concern. ODA, along with partner organizations, has plans in place to limit and control the spread of this destructive, invasive beetle.
Japanese Beetles in Oregon Extension publication: https://catalog.extension.oregonstate.edu/em9158
Oregon Invasives Hotline: https://oregoninvasiveshotline.org
PDX Japanese Beetle site: http://www.japanesebeetlepdx.info
If you suspect that you have an infestation, do not apply pesticides yourself. Instead, call the Oregon Invasives Hotline at 1-866-INVADER to report Japanese beetle.
The following is a list of trees favored by Japanese beetle, though they are unlikely to kill a medium to large-sized tree:
- American mountain-ash
- Apple, crabapple
- Black walnut
- Crape myrtle
- Horse chestnut
- Peach, apricot
- Western red cedar, arborvitae