Weed Resistance Management in Agronomic Row Crops, Trees, Nuts & Vines 
The purpose of this training is to give you an overview of important management practices that can help avoid or delay the development of herbicide-resistant weeds. We will begin with a brief review of common weed types and herbicides, followed by factors that can influence the evolution of resistance in weeds, and methods for potentially delaying its occurrence in agronomic row crops and permanent crops. While weed resistance management guidelines may be introduced and discussed under a specific annual or perennial crop heading, many of the WRM techniques have cross-crop applicability. When using pesticides for resistance management, always check the label for specific registered uses and the Herbicide Group Number for Mode of Action (MOA), as well as contact your local University Extension Advisor, PCA, and/or manufacture representative.
- Lectures 10
- Questions 40
- Duration 1 h (approx)
This course is accredited by:
- California Department of Pesticide Regulation (1 hour – 'Other')
- Arizona Department of Agriculture (1 hour)
- Certified Crop Adviser (CCA) Accredited in U.S. and Canada (1 hour IPM; 1 hour Crop Management)
- Delaware Department of Agriculture (1 credit PA, 1A)
- Florida Department of Agriculture (1 CEU, General Standards/Core, Category 482 & 487)
- Georgia Department of Agriculture (1 hour private, 10)
- Hawaii Department of Agriculture (1CEU, Private 1, Commercial 1a, 10)
- Idaho Department of Agriculture (1 credit)
- Maryland Department of Agriculture (3 credits 1A)
- Michigan Department of Agriculture and Rural Development (1 credit 1A, Comm CORE, Priv CORE)
- Montana Department of Agriculture (1 credit, categories 10, 30, 39, 60. *Maximum of 6 credits for online training per recertification cycle for commercial, government, dealers, non-commercial, and private applicators)
- Nevada Department of Agriculture (1 CEU General)
- New Jersey Department of Environmental Protection (2 units in 1A, PP2)
- New Mexico Department of Agriculture (1 hour General, PRAP, PRRO)
- Oklahoma Department of Agriculture, Food, and Forestry (1 Hour, Category 1A & 10)
- Oregon Department of Agriculture (1 credit)
- Pennsylvania Department of Agriculture (2 hours each: PC, 01, 02, 10, 18, 23)
- South Carolina Department of Agriculture (1 credit Core)
- Tennessee Department of Agriculture (1 CEU in 1, 4, 10, 12)
- Texas Department of Agriculture (1 credit general-Pesticide Factors)
- Virginia Department of Agriculture (1 credit in Category 90)
- Washington Department of Agriculture (1 credit)
- West Virginia Department of Agriculture (2 credits, categories 1, 11, 12, private applicator)
- Wyoming Department of Agriculture (1 CEU)
It is accredited for licensing categories: PCAs, Qualified Applicators, Private Applicators, Aerial Applicators, and County Permit Holders.
Our thanks go to the following individuals for information and assistance in developing and/or providing expert review of this course: Ron Vargas, University of California Cooperative Extension farm advisor retired, Madera County; Fresno County UC Cooperative Extension farm advisor Kurt Hembree; Bradley D. Hanson, Tom Lanini, and Joe DiTomaso, Extension Weed Specialists with the University of California, Davis; Bill McCloskey, Cooperative Extension Weed Specialist at the University of Arizona; and Tim Underwood, Agricultural/Chemical Representative with Monsanto Company.
A special thank you also goes to the UC Integrated Pest Management program and talented photographers Jack Clark, Tom Lanini, James A. O'Brien, Clyde Elmore, and Joe DiTomaso for the weed photos used in the course. The following materials were also consulted: IPM in Practice(UCANR publication 3418); The Safe and Effective Use of Pesticides,Second Edition (publication 3324); numerous on-line sources, including information from the Herbicide Resistance Action Committee (http://www.hracglobal.com/), the Weed Science Society of America (www.wssa.net), the International Survey of Herbicide Resistant Weeds (www.weedscience.org) and the University of California Statewide Integrated Pest Management Program (www.ipm.ucdavis.edu). Another excellent resource is the UC Weed Research and Information Center (wric.ucdavis.edu).
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