OSU publishes new guide to 'least wanted' plants in PNW

August 7, 2003

CORVALLIS – They block our way through the woods. Crowd out native plant and wildlife species. You don't want them in your backyard - they reduce property values. Yet they're almost everywhere.

Invasive weeds cover millions of acres and cost society millions of dollars in Oregon and most of the rest of the world.

The first step in getting rid of any invader is to learn to recognize your enemy.

Hot off the press is a new guide to the Pacific Northwest's most dominant or potentially invasive weeds, published by the Oregon State University Extension Service. "Invasive Weed Identification and Management (Pacific Northwest's Least Wanted List)" is a 44-page guide, written by OSU Extension weed specialist Jed Colquhoun.

The pernicious plant invaders covered in the guide include species rampant on both sides of the Cascades, including: Scotch broom, English ivy, false brome, kudzu, purple loosestrife, yellow starthistle, toadflax, Canada thistle, knapweed and more than 30 others.

The guide provides color photos of each species, lists identifying characteristics, origin, habitat, ecology and gives several choices for control strategies, including physical removal, biological control, burning and herbicides.

"The list of species covered is not all inclusive of all invasive weeds in the Pacific Northwest," explained Colquhoun. "It focuses on the most dominant or potentially invasive species that plague our land."

For more information on "Invasive Weed Identification and Management," EC 1563, visit our on-line catalog. Our publications and video catalog at: https://catalog.extension.oregonstate.edu/ shows which publications are available on the Web and which can be ordered as printed publications.

Author: Carol Savonen
Source: Jed Colquhoun