Lynn Ketchum

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Biological control of weeds

Biological control is a form of weed control that uses a living agent to control weeds. A bio control agent can be insects, fungus, or grazing animals. A good bio control "bug" never completely destroys its plant host, but...

Shelby Filley | Sep 2020 | Article

Onion Response to Talinor Herbicide - A Virtual Field Tour

A Malheur Experiment Station virtual field tour. Weed Scientist Joel Felix discusses a field trial evaluating the herbicide Talinor for use in onions.

Christy Tanner | Aug 2020 | Video

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

Integrated Management of Downy Brome in Winter Wheat

Downy brome (Bromus tectorum L.), also known as cheatgrass, is especially troublesome in low precipitation production areas where crop rotations are mostly limited to winter wheat followed by a year of summer fallow. The invasive ...

Andy Hulting | Aug 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 | Jun 2020 | OSU Extension Catalog

Aquatic Weeds

This document is a copy of my slides for a presentation on Aquatic Weed Control. Initial slides describe the main types of aquatic weeds by growing style. The reason this is done is that the control methods are based on weed type. Examples of each these main types are provided. Control methods and ways to measure pond area (shoreline or water) are provided. Specific aquatic herbicide recommendations are not provided here. Please see the PNW Weed Control Handbook, Aquatic Weed section ( for specific herbicides and more on controlling aquatic weeds.

Shelby Filley | May 2020 | Educational document

Spring Events to Watch out For

Due to the coronavirus threat, we have postponed our spring series of Extension Forestry education events. We are working on the development of remote learning alternatives to deliver education programs on key topics. Most likely ...

Apr 2020 | Article

2020 PNW Weed Management Handbook

This comprehensive guide to weed management in the Pacific Northwest covers biological weed control agents; pesticide safety and disposal; agrichemicals and their properties; and control of problem weeds. Sections include subjects such ...

Ed Peachey | Apr 2020 | OSU Extension Catalog


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