Lynn Ketchum

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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

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

Harvest Weed Seed Control: Applications for PNW Wheat Production Systems

This publication discusses the various HWSC systems and their potential suitability for PNW wheat production systems across rainfall regions.

Andy Hulting | Nov 2019 | OSU Extension Catalog

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?

A: View answer | View all featured questions

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

Management strategies for dealing with select poisonous plants in Oregon.

Rangeland, pastures and hay fields throughout Oregon often contain poisonous plants that are potentially dangerous to cattle and other livestock.

Andy Hulting, Karin Neff | Sep 2019 | Article