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Weeds and WeedMapper

​​​​​​​Oregon is a US leader in implementing biocontrol as part of its integrated pest management approach to managing noxious weeds. The Oregon Department of Agriculture (ODA) Noxious Weed Program has adopted the International Code of Best Practices for biological control of weeds. Only safe, effective, and approved natural enemies will be used for biocontrol.

What are biocontrol agents?

ODA works with USDA and other scientists who visit the original location of the weed to find natural enemies that can be tested as candidates for introduction as biocontrol agents in the US.

Before release in Oregon, agents are rigorously tested to ensure they are the following:

  • Safe and will not become pests of crops and native plants
  • Clean from disease and parasites

How do they work?

  • Biocontrol agents destroy plant tissues and cause stress to the weeds, making them less competitive against desirable flora.
  • Once the agents are released and established in Oregon, ODA staff and cooperators collect and redistribute biocontrol agents to other infested areas throughout the state.
  • It may take 10-20 years for a biocontrol project to successfully control a weed at the regional scale.

Oregon noxious weed biocontrol agents



Biological control of noxious weeds in Oregon (2015)

A guide to common biological control agents found in Oregon. Biological control agent guide

Biological control release form

Biological control agent release form

Code of Best Practices for Classical Biological Control of Weeds

Code of best practices

Fact sheet: Sellwood neighborhood biocontrol migration event (2015)

Information on the Galerucella beetle migration in Sellwood, Oregon. Galerucella beetle migration fact sheet


Joel Price
Biological Control Entomologist
Noxious Weed Control
635 Capitol St NE
Salem, OR 97301
Phone: 503-385-6517