Weeds

Weeds are considered the #1 pest in agroecosystems. They compete with desirable plants and can reduce yields, and alter soil structure and quality. Weed management requires thoughtful planning and action. Use the resources below to help reduce the effect of weeds in your crop, garden, or landscape.

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Photo by Robert Emanuel. (Cropped from original)

Featured Resources

Puncturevine

A member of the Caltrop family, this weed produces woody fruits that always land with one sharp spine pointed upward. Spines injure hooves, feet, and vehicle tires. A toxin from the plant may be linked to photosensitization ...

Robert (Bob) Parker | Apr 2020 | OSU Extension Catalog

Integrated Management of Feral Rye in Winter Wheat

Feral rye (Secale cereale L.), also known as volunteer rye, is a troublesome weed in winter wheat production in the low- and intermediate-rainfall zones of eastern Washington and Oregon and southern Idaho. This publication ...

Andy Hulting, Judit Barroso | Jun 2020 | OSU Extension Catalog

Malheur Experiment Station Virtual Field Tour - Controlling Glyphosate Resistant Weeds in Sugarbeets

Learn about an applied research project that is testing herbicides for the control of glyphosate resistant weeds in sugarbeets.

Christy Tanner, Joel Felix | Aug 2020 | Video

Malheur Experiment Station Virtual Field Tour - Sonalan Tank Mixes for Weed Control in Potato

Learn about an applied research project evaluating tank mixes of the herbicide Sonalan for controlling weeds in potato.

Christy Tanner, Joel Felix | Aug 2020 | Video

Latest Resources

Vegetable Degree-day Models: An Introduction for Farmers and Gardeners

Degree-days measure the amount of heat accumulated over time. Researchers have used years of this data to develop models that help farmers and gardeners predict harvest dates and other important events in select crops and weeds....

Nick Andrews, Leonard Coop, Heather Stoven, Heidi Noordijk, Aaron Heinrich | Jan 2021 | OSU Extension Catalog

Plants Causing Physical Injury in Pastures

Many plants have characteristic that can cause injury to grazing animals. Some grasses can be palatable when young, but can cause injury to the nose, eyes, mouth and ears of grazing animals when plants mature with long awns.

Mylen Bohle, David Hannaway, Andy Hulting, Karin Neff | Apr 2018 | Educational gallery

Plants Causing Irritation in Pastures

Plants in this group contain compounds that may irritate an animal's digestive tract, mouth or skin if consumed. These plants are not generally palatable and are typically avoided.

Mylen Bohle, David Hannaway, Andy Hulting, Karin Neff | Apr 2018 | Educational gallery

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Latest News

Roll up your sleeves: Use multiple strategies to control invasive weeds

Keeping weeds at bay can be frustrating, but it can be done.

Kym Pokorny | Aug 14, 2020 | News story

Dig into hundreds of publications from OSU Extension online catalog

Have a gardening question? Find an answer in one of OSU Extension's publications.

Kym Pokorny | Nov 22, 2019 | News story

OSU researchers present findings at Turf Field Day

OSU Extension researchers presented field trial results on fine fescues and annual bluegrass at Turf Field Day.

Chris Branam | Oct 10, 2019 | News story

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Horticulture Weeds

Contact for questions on vegetable production: processed, fresh market, and seeds

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Weed Science

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How can I naturally kill dandelions?

Q: Is there a solution I can spray on dandelions instead of pulling them up? Not Roundup.... does vinegar, dawn soap and Epson salts work? Or is there a better one?

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