Noxious and Invasive Species

White campion, also known as white cockle, contaminates hay fields, roadsides, ditches, and fencerows because of its high rate of seed production and tolerance to many herbicides. This publication pro ...

An abundant seed producer, this weed grows in meadows, pastures, along roadsides, and in noncrop areas. Also known as Queen Anne's lace, wild carrot is listed as a Class B noxious weed in Washingto ...

With a spiny fruit capable of injuring hooves, feet, and vehicle tires, growers from across the spectrum can learn to effectively manage this weed.

Both field and hedge bindweed smother crop plants, fencerows, and forest understories. Learn how to identify and control these invasive, problematic vines.

Phytophthora species are water molds that can kill plants. They can spread undetected in container plants and equipment. Once they are introduced to an ecosystem, it's difficult or impossible to eradicate them. Nurseries can help prevent the spread of Phytophthora by following some simple steps. Learn how to protect native plants from sudden oak death and other Phytophthora species. By: Norma Kline, Marianne Elliott, Jennifer Parke, Dan Stark, Dave Shaw and Alicia Christiansen

The emerald ash borer is an invasive, wood-boring beetle that causes nearly 100% mortality in infested ash trees: learn how to identify this pest and the latest management recommendations.

This publication is intended for Extension professionals, master gardeners, public agency personnel, tree care professionals, and those who are interested in an in-depth review of the current state of knowledge about EAB and the implications for potential damage and mitigation strategies in Washington State.