Weeds
Agronomics of Leasing Fields for Potato Production
Leasing or renting fields for potato production may make it easier for growers to either start an agricultural career or expand one but be forewarned: gather as much background information as you...
Alaska Field Guide to Potato Pests and Beneficial Insects in English and Russian
This 128-page pocket-sized manual helps potato field workers scout for and identify economically important diseases, insects and weeds in potato crops in Alaska. Each pest or beneficial insect is...
Best Management Practices For Managing Herbicide Resistance
Herbicide resistance is a problem that has quickly spread throughout wheat-growing regions of the inland Pacific Northwest. This timely PNW publication offers best management practices (BMPs) for...
Black medic ( Medicago lupulina ) is an annual or short-lived perennial from Eurasia. It can be found in lawns, pastures, rights-of-way and other marginal sites. Learn how to manage this...
Buckwheat Production West of the Cascades
Naturally gluten-free, buckwheat has a variety of culinary uses regionally and internationally. Learn about market opportunities, how to establish a strong stand, and the best management and...
Bull Thistle: Identification and Control
Bull thistle is a biennial, which means it typically takes two growing seasons to complete its life cycle. This video will introduce you to the life cycle of Bull thistle, how to identify it,...
Centrocoris volxemi—A Newly Introduced Idaho Insect
Centrocoris volxemi is an introduced non-native true bug (insects with piercing-sucking mouthparts) that has been expanding its known range in the United States since 2020 and Idaho the year after.
Chateau Herbicide for Use in Potatoes
Chateau can be used in a weed management program to provide hairy nightshade control. The publication discusses mode of action, herbicide characteristics, application rate and timing, weeds...
Chemical Weed Control in New Spring-Seeded Alfalfa
Weed management is one of the most important practices in alfalfa production, particularly in new seeding. This bulletin briefly discusses two chemical-based approaches: preemergence or preplant...
Curlycup gumweed ( Grindelia squarrosa ) (Pursh) Dunal is native to North America except in the southeastern United States. This forb (herbaceous broadleaf plant) is commonly found along roadsides,...
Different Treatment Options for Russian Olive
Russian olive is a thorny, small and highly invasive tree that thrives in southern Idaho's arid climate. The sometimes shrubby tree often crowds out native vegetation areas along the banks of...
Effective Termination of Cover Crops before Planting Cash Crops
Because of legitimate concerns about weed potential, Idaho farmers often hesitate to plant cover crops, even though the practice improves soil health and fertility, among other documented benefits.
Covers the biology, detection and management of this invasive aquatic plant. Includes illustrations and descriptions of similar species and estimated costs for various control options, including...
Field Guide for Integrated Pest Management in Pacific Northwest Vineyards
To produce high-quality wine and juice grapes, effective pest management is essential. The second edition of Field Guide for Integrated Pest Management in Pacific Northwest Vineyards addresses this...
From Weeds to Flowers: Creating Sustainable Wildflower Meadows in Arid Climates
Wildflower meadows have the potential to benefit homeowners, public land managers and commercial property caretakers in numerous ways. They can beautify landscapes, simplify maintenance, strengthen...
Genetically Engineered Alfalfa and Feral Alfalfa Plants: What Should Growers Know?
Alfalfa is the world's most important forage crop, and the western U.S. is its most important production area. Feral alfalfa is common and can potentially lower the genetic purity of alfalfa seed...
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. Authors: Drew Lyon, Michael Walsh, Judit Barroso, Joan...
Herbicide Drift and Carryover Injury in Potatoes: Recognizing the Symptoms
We're sorry, this publication is temporarily out of stock. Please contact Extension Publishing at calspubs@uidaho.edu for more information. Fifty-two full color photographs show symptoms of...
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...
Idaho Forage Handbook (third edition)
This comprehensive information source for anyone who grows forage in Idaho or neighboring states covers topics from species and variety selection to pest control to harvest management, hay storage...
Idaho Spring Barley Production Guide
Barley is one of Idaho’s most important crops. Although its harvested acreage has decreased in the past twenty years, the state is still the nation’s top barley producer. Published in 2003, this...
Idaho's Noxious Weeds, 10th edition
$7 This newest edition of our popular pocket guide shows all the weeds on Idaho's official noxious weeds list, including examples of the three newest additions. Inside find true-color photos of...
Improving Weed Control in Dry Bean Using Narrow Planting
Season-long control of weeds is an important goal when growing dry beans. Hairy nightshade, lambsquarters, redroot pigweed and green foxtail in particular harm bean yields in southern Idaho. This...
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...
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, Oregon and southern...
Integrated Management of Mayweed Chamomile in Wheat and Pulse Crop Production Systems
In small grain and pulse crops throughout the high rainfall zones of the Inland Pacific Northwest, mayweed chamomile is a troublesome weed. Individual plants can produce as many as 17,000 seeds,...
Integrated Management of Mustard Species in Wheat Production Systems
Blue mustard, flixweed and tumble mustard can be a headache to control when it comes to winter wheat; this article shows you how it can be done. Authors: Drew Lyon, Ian Burke, Joan Campbell 9 pages
Integrated Management of Prickly Lettuce in Wheat Production Systems
Prickly lettuce is a common weed in wheat production systems throughout the PNW, but it's difficult to manage. Herbicides can control prickly lettuce in wheat, but many biotypes have developed...
Integrated Management of Wild Oat in the Pacific Northwest
In the Pacific Northwest (PNW), wild oat has become a notable weed pest of small grain and rotational crops, including pulse crops, potato, sugar beet and oilseed crops. It has infested more than 3...
Integrated Pest Management of Leafy Spurge
Leafy spurge is a highly invasive and aggressive weed that forms dense stands, significantly reducing the carrying capacity of rangelands or pastures by 50% to 75%. Part of an integrated pest...
Integrated Weed Management in Dry Edible Beans
Describes problem weed species and the steps involved in integrated weed management: includes 20 full-color photographs of weed seedlings and a table listing the susceptibility of 26 weeds to...
Italian Ryegrass Management in Inland Pacific Northwest Dryland Cropping Systems
Widespread herbicide resistance in Italian ryegrass makes integrated weed management strategies difficult for this problematic weed. Learn about the multiple control methods and their combination...
Knotweed Shrubs: Identification, Biology, and Management
Being able to correctly identify the five knotweeds that grow in the Northwest can help you choose the best control strategies. Color photographs of the weeds accompany a detailed chart describing...
Know Your Herbicide-Resistant Weeds
$1.50 The number of herbicide-resistant weeds continues to increase in the United States. This is a huge concern for farmers, since weeds compete with crops for nutrients in the soil, potentially...
Management of Goats for Controlling Noxious Weeds: A Primer
This publication presents an introduction to the use of goats for controlling noxious weeds, including the use of different goat management methods for various weed conditions. Authors: Shannon...
Management Strategies for Preventing Herbicide-Resistant Grass Weeds in Clearfield Wheat Systems
Based on computer modeling, the publication describes herbicide rotation strategies aimed at preventing the buildup of herbicide-resistant grass weeds (downy brome, jointed goatgrass and wild oat)...
Matrix in Weed Management Systems for Potatoes
Provides information on Matrix's mode of action, its effectiveness on various weed species, and how to use it to maximize its strengths and avoid hazards of misuse. Authors: Pamela Hutchinson,...
Meadow Deathcamas in the Pacific Northwest
Found in all areas of the Pacific Northwest, meadow deathcamas (Toxicoscordion venenosum) is capable of killing livestock whether eaten as forage or in dried hay. Human poisonings have been...
Mustards in Mustards: Guide to Identification of Canola, Rapeseed, and Related Weeds
This four-color, field-oriented identification guide allows users to identify rapeseed, canola and mustard crop plants and their related weeds. A durable folder holds nine full-color identification...
Nightshade: Biology and Control in the Pacific Northwest
Covers nightshade distribution in the Pacific Northwest; identification of hairy, black, cultleaf and bittersweet nightshades; nightshade biology and toxicity; crop damage; and control practices...
This two-page fact sheet for use in the field offers recommendations for growing onions in Idaho, with pointers or information on growth stages and development, planting, fertilization, irrigation,...
Outlook Herbicide for Weed Control in Potatoes
Describes mode of action, use rates, application methods, weeds controlled, potato variety tolerances and follow-crop restrictions. Provides U of I research data on percentage control of various...
How to recognize and manage oxeye daisy in pastures, rangelands and road sides. Color photographs. Authors: Steven Hines, Timothy S. Prather, Sandra Robins 4 pages
Pacific Poison-oak and Western Poison-ivy: Identification and Management
Pacific poison-oak and western poison-ivy are both native to the Pacific Northwest. All parts of these plants contain urushiol, an oily toxin that can cause an allergic reaction of contact...
Pasture and Grazing Management in the Northwest
$35 The comprehensive resource for anyone who manages livestock on pastures in the Northwest, this 214-page book offers pasture managers information and tools to enable their pastures and their...
Pasture and Range Plants that Endanger Livestock in Southwestern Idaho
$7 This publication is a basic guide to thirty-five common toxic plants found in southwestern Idaho pastures and rangelands. Concise plant descriptions, paired with stunning photography, will help...
Pasture Principles for Smaller Acreages
Ranchettes and small farms are cropping up in rural landscapes across Idaho, spurring demand for information on pasture management. This updated publication addresses the most common concerns...
Pigweeds: Current and Emerging Weed Threats in the Pacific Northwest
Pigweed is an invasive plant pest usually found in disturbed areas, like farmland and along roadsides and fencelines. Because their aggressiveness can reduce crop yields, this PNW discusses how to...
Potato Psyllid Vector of Zebra Chip Disease in the Pacific Northwest
This publication addresses the emergent issue in the PNW of a potato infection called zebra chip disease, vectored by the potato psyllid. Includes information on the bacterium, the biology of the...
With a spiny fruit capable of injuring hooves, feet and vehicle tires, growers from across the spectrum can learn to effectively manage this weed. Authors: Dale K. Whaley, Robert Parker, Rick...
This two-page fact sheet offers recommendations for growing dry beans in southern Idaho, with pointers on soil sampling and testing, fertilization, irrigation and insect, weed and disease control.
Quick Facts: Palmer amaranth (Amaranthus palmeri)
Palmer amaranth is a pigweed that causes significant yield loss in sugar beet, dry bean and potato. Its adaptability is a key factor, which has helped it to develop resistance to at least nine...
Rattail Fescue: Biology and Management in Pacific Northwest Wheat Cropping Systems
Mitigating rattail fescue has become easier: this publication addresses this increasingly common weed in Pacific Northwest cropping systems. Authors: Drew J. Lyon, Daniel A. Ball 12 pages Revised...
Rush skeletonweed is an exotic herbaceous biennial or creeping perennial plant that aggressively infests rangeland, cropland and disturbed areas. Along with explanations of management strategies,...
Russian Olive Trees: Control and Management in the Pacific Northwest
Russian olive trees are fast-growing plants that since the 1950s have become invasive throughout many areas of the Inland Pacific Northwest, particularly in riparian ecosystems. They form...
Russian Thistle: Management in a Wheat-Fallow Crop Rotation
Russian thistle is the most economically important summer-annual broadleaf weed found in the low-precipitation zone of the inland Pacific Northwest. This weed causes serious management problems in...
Scotch thistle is a noxious regional weed that was introduced to the United States in the 1800s as an ornamental plant from the Mediterranean region. At its worst, it forms dense, virtually...
Spring Barley Quick Facts (2023 Southern Idaho)
This two-page fact sheet offers recommendations for growing spring barley in southern Idaho, with pointers or information on growth stages and development, rotation and seeding, irrigation,...
Spring Hulless Food Barley Production Quick Facts
This two-page fact sheet offers recommendations for growing spring hulless food barley in southern Idaho, with pointers or information on nutrition, rotation and seeding, growth stages and...
Targeted Tank Mixtures for Weed Control in Potatoes
Managing weeds in potato fields with an integrated approach — using all available cultural, mechanical, chemical and biological tools — is more effective than relying on any single weed-control...
Weed and Vegetation Management in Christmas Trees
Describes the top dozen weeds in Christmas trees and strategies for managing them, including prevention, mechanical control, control with cover crops and vegetated strips, flame weeding, biological...
Weed Control and Potato Crop Safety with Metribuzin
Effective use of metribuzin, a triazinone herbicide for weed control in potato fields, has evolved since our last publication a decade ago. This twelve-page update provides recommendations for...
Weed Control Methods for Perennial Crops
Weed control for perennial crops requires more than yearly tillage and crop rotation. Indeed, practices like repeated cultivation, herbicide application or their combination prove the best additions.
Western Waterhemlock in the Pacific Northwest
Western waterhemlock ( xCicuta douglasii ) is the most poisonous plant in North America — a piece of root no larger than a walnut can kill a mature cow. Every part of the plant is toxic. To help...
White campion or white cockle infests hay fields, roadsides, ditches and fencerows. Learn how to identify, prevent and control white this prolific seed producer in this three-page profile, lushly...
An abundant seed producer, wild carrot grows in meadows, pastures, along roadsides and in non-crop areas. A Class B noxious weed in Washington, the pest ruins cultivated carrot seed and possibly is...