Jointed Goatgrass



Annual; Foliage is a deep bluegreen. Prior to seed formation plants tend to lie flat on the ground. Spikelets are awned, the longest awns at the top of the spike. Seedheads break into...

Reduce Weeds by Friending Grasses


Are weeds a never-ending challenge for you? If so, consider looking at them from a new angle. Instead of spraying or digging weeds out year after year, concentrate on making your grass happy. The factors that promote optimal grass health and production work against weed growth. What is good for grass is not good for weeds.
small white flowers of poision hemlock

Poison Hemlock (Conium maculatum) – Silage Will Not Reduce the Toxin


Poison hemlock is one of the most poisonous of plants. Silage making has been used to reduce the concentrations of toxins in a variety of crops. Poison hemlock alkaloids are found in different concentrations depending on several factors that make it virtually impossible to predict how dangerous the plant is at any given time.

By Cassie Bouska

Tansy Ragwort


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

By Shelby Filley, Andy Hulting, Gene Pirelli

Poison Oak Facts


If you are a woodland owner in Southern Oregon, you know about poison oak. If you are new to the area, you’ll soon get acquainted with this widespread shrub.

Blackberries: Friend or Foe?


The blackberry is a delicious fruit and an important sources of food and cover for many birds and mammals. It is a hardy relative of the rose. However, many specious are considered noxious weeds. A single cane can develop into a six square yard thicket in less than two years quickly overtaking any area you have for planting.

Weed management for blueberry fields in the Pacific Northwest


Weeds are always a difficult problem in blueberry production! They start to show up shortly after transplanting, and tend to become more problematic as time goes on. There are, however, strategies that help to control weeds in blueberry. This article will discuss some thoughts about weed control in blueberry, and some of the strengths, and weaknesses, of currently registered herbicides.

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

Blackberry Rust Fungus: Possible New Biological Control


Blackberry is one of the most widespread and devastating invasive weeds on the west coast. Available cultural, chemical, and mechanical control treatments are effective on a small scale and will continue to be part of an integrated pest management program for blackberry. Biological control is an important addition to currently available control methods to significantly reduce landscape-level impacts by this aggressive weed.

Rich Affeldt, OSU Extension Plot Tour, COARC, June 9, 2009


Rich Affeldt, OSU Extension Crop Scientist conducts a plot tour at the Central Oregon Agricultural Research Center looking at Calliso a new herbicide from Syngenta registered on Kentucky bluegrass grown for seed.