Washington State University Extension

Integrated Pest Management Program


Field Crops IPM

Cover of Hop Pocket GuideBilingual Pocket Guide for
IPM in Pacific Northwest Hops
In tandem with the Field Guide below, this handy Pocket Guide, released in January 2010, provides a comprehensive resource for integrated pest management in hops. This full-color guide is packed with photos to aid in in-field diagnosis of pest and beneficial arthropods, diseases, weeds, nutrient deficiencies, and herbicide damage. Text is provided in both English and Spanish.

2009 Hop IPM Handbook


IPM in Pacific Northwest Hops
This 84-page, full-color handbook addresses the management of disease, weed, and arthropod pests as well as beneficial organisms in hops within an integrated framework. A collaborative project between WSU, Oregon State University, University of Idaho, and USDA-ARS, the handbook was funded by a grant from the EPA/ CSREES' Pesticide Safety Education Program. The handbook includes over 200 color photos to aid hop yard managers and field workers in identifying pest and beneficial organisms in the field.



Alfalfa Burning CollageAlfalfa Seed "Alternatives to Burning" Research
An interdisciplinary team of WSU and USDA-ARS research scientists representing entomology, plant pathology, and weed science sought and received funding from the Washington State Department of Ecology in May of 2005 to conduct research on the economy and pest management implications of various potential alternatives to burning alfalfa seed stubble. The results of these studies are presented in the following reports:

June 2007 Final Report February 2007 Progress Report
June 2006 Progress Report

February 2006 Preliminary Report

Seed Corn Maggot

Carrot Research at WSU Prosser
Seed treatments against seed corn maggot were conducted in 2002. As a result of this work, low-toxicity imidacloprid was subsequently registered as a seed treatment, resulting in a decrease of diazinon use by some 4,000 lb annually on the part of Washington State carrot growers. Click on link below.

Onion Research at WSU Prosser
Onion thrips and Western flower thrips are key pests of dry bulb onion in Washington State. Results from research conducted 2005-2007 show best approach to onion thrips management. Earlier studies found Western flower thrips to be more abundant than onion thrips and that thrips were more abundant within onion fields compared with weedy field borders. Insecticide efficacy trials in 2002 showed that no insecticide tested was successful in suppressing thrips for more than two weeks.

Mint Research at WSU Prosser
Good control was documented for many of the insecticides tested against spotted cutworm in mint. Similarly, many acaricides successfully suppressed two-spotted spider mite in mint efficacy trials, but also suppressed predatory mites. The miticide abamectin, and the insecticides acephate and chlorpyriphos, proved significantly lethal to both species of predators in leaf-disk bioassays. Repellency and repulsiveness behaviors in two-spotted spider mite were examined for pesticides utilized in mint.

Two generations of spotted cutworm were observed in mint. It is the second generation that overwinters and causes damage in mint the following spring.

A mint grower survey was conducted across Washington in 2003. Growers were polled on pest management practices and results were compared to a 1995 Washington mint survey. The results, indicating changes in pests, pesticide usage, and pest management practices, were published in two (short version and long version) WSU Extension Bulletins which are linked below.

Office of the State IPM Coordinator, WSU- IAREC, 24106 N. Bunn Rd., Prosser, WA 99350, 509-786-2226, IPM Site Webmaster