Weeds

Share on

Featured Resources

OSU Extension Catalog

Herbicide-Resistant Weeds and Their Management

Keep weeds in your fields from becoming herbicide resistant by rotating among herbicides regularly. Learn how and why in this publication. Especially useful is a color-coded chart to help you distinguish among herbicides that sound different but kill weeds in exactly the same way.

By Carole Smith, Andy Hulting

Several species of foxtail-like grasses invade western Oregon.

Article

Foxtail Control in Pastures and Hayground

Foxtail is a problematic grass in pastures and hayground, and infestations need immediate attention. Small infestations of foxtail should be spot treated, while larger infestations require whole pasture renovation. This informational paper describes proper foxtail management and control in a forage setting.

By Shelby Filley

Article

Tansy Ragwort

Biological control of Tansy Ragwort and additional information and advice including herbicide options.

By Shelby Filley, Andy Hulting, Gene Pirelli

Article

Poison Hemlock and Western Water Hemlock – Deadly plants that may be growing in your pasture

Poisonous plants are a major cause of economic loss to the livestock industry. This article will focus on two common plants in Oregon: poison hemlock and western water hemlock. Ingestion of either of these plants by humans or livestock typically results in death.

By Scott Duggan

Latest Resources

Presentation

Controlling crabgrass, Bermuda grass, and nutsedge in your lawn

Presentation on controlling crabgrass, Bermuda grass, and nutsedge in your lawn

Video

IPM Downy Brome

Presentation by Judit Barroso, OSU Weed Scientist, on Integrated Weed Management for Downy Brome in Winter Wheat

By Judit Barroso

Browse All Resources

Latest News

News Story

A prickly problem: Russian thistle populations in northeastern Oregon resist glyphosate

Mar 14, 2017

Wheat farmers rely extensively on the herbicide to control the weed

By Chris Branam
Mar 14, 2017

News Story

Pull weeds as they pop or plants will suffer

Apr 15, 2016

Extension expert offers advice on how to control stubborn weeds

By Kym Pokorny
Apr 15, 2016

News Story

How to manage three common weeds in the vegetable garden

Jul 26, 2013

Knowing more about weeds can give gardeners a leg up in the fight, said Ed Peachey, weed specialist for the Oregon State University Extension Service.

All News

Upcoming Events

Pleasant Hill, OR

Science Pub: Most Unwanted Invasive Species

Tue, Mar 26, 2019 5:50 pm - 7:30 pm

Science Pub: Most Unwanted Invasive Species

Join us at the Hilltop Bar and Grill in Pleasant Hill, and learn to identify and control the common invasive plants that threaten the health and diversity...

Central Point, OR

Weed Management

Mon, Apr 1, 2019 6:00 pm - 8:00 pm

The first step to conquering weeds is learning to identify them. A management plan can then be formulated using an integrated weed program. Instructor: Maud Powell, OSU Small Farms Program

Pleasant Hill, OR

Identification and Control of Invasive Weeds

Thu, Apr 11, 2019 6:00 pm - 8:00 pm

Want to learn more about what invasive weeds to look for in our watershed? Join us and the Middle Fork Willamette Watershed Council to get first hand information from the experts about what threats...

Meet Our Experts

Judit Barroso

Weed Science

Brooke Edmunds

Community Horticulture/Master Gardeners

Jessica Green

Senior Research Assistant

Andy Hulting

Weed Control

Have a Question? Ask an Expert!

Ask an Expert is a way for you to get answers from the Oregon State University Extension Service. We have experts in family and health, community development, food and agriculture, coastal issues, forestry, programs for young people, and gardening.

Ask Us a Question

What should I be doing now for weed control?

The straw mulch I used at the end of summer to suppress the weeds doesn't seem to be working. Should I till it and cover with plastic? black or clear? Is there something better. Or should I add more straw. I could probably bring some cardboard home from work. Is this a healthy option?

See More Questions