Weed Management in Orchards and Vineyards [2025]

OVERVIEW

In production agriculture, weeds or “misplaced plants” have a tendency to tolerate suboptimal conditions much better than most crops. However, they grow more and produce more seed under optimal conditions than they do under suboptimal. For example a nine-foot tall horseweed growing in a vineyard produces 800,000 seeds while a foot tall horseweed growing on a dry, hard road shoulder produces only about 1,000 seeds. Weeds are unwanted plants that compete with crops for nutrients, light and water, and can be detrimental to crop yields. Integrated weed management (IWM) programs and orchard cultural practices have been developed for specific orchard and vineyard crops. This accredited CEU provides information on economically and environmentally sound IWM practices. This course will provide an overview of important weed control and management practices as well as some insight into managing for herbicide-resistant weeds.

Course Features

Lectures 8
Questions 20
Duration 1.5 h (approx)

COURSE OUTLINE
- Defining Weeds and Weed Control Options
  
  10 min.
- Herbicide Mode of Action
  
  4 min.
- Weed Management in Tree Crops
  
  17 min.
- Weed Management in Vineyards
  
  6 min.
- Integrating Prowl H2O into Weed Management Programs
  
  11 min.
- Weed Resistance
  
  8 min.
- Detecting Weed Resistance
  
  5 min.
- WRM Strategies
  
  9 min.

CREDIT INFORMATION

This course is accredited by:

California Department of Pesticide Regulation (1 hour Other)
Certified Crop Adviser (CCA) Accredited in U.S. and Canada (1.5 hours IPM)
Delaware Department of Agriculture (1 credit PA, 1A)
Florida Department of Agriculture (1 CEU, General Standards/Core, Category 482 & 487)
Georgia Department of Agriculture (Private, 1 hour, Category 10)
Hawaii Department of Agriculture (1 CEU, Private 1, Commercial 1a, 10)
Idaho Department of Agriculture (1 credit)
Maryland Department of Agriculture (2 credits, Pvt, 1A)
Michigan Department of Agriculture and Rural Development (1 credit 1C, Priv CORE)
Montana Department of Agriculture Commercial (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 1A, PP2) *Due to a recent change in NJ rules, in order to receive credit, NJ licensees must submit a photo of themselves holding their license, with the course open on their computer behind them. Send to [email protected]*
New Mexico Department of Agriculture (1 Credit: General, PRAP)
Oklahoma Department of Agriculture, Food, and Forestry (1 Hour, Category 1A & 10)
Oregon Department of Agriculture (1 Credit, Other)
Pennsylvania Department of Agriculture (2 credits each: PC, 02, 18)
South Carolina Department of Agriculture (1 credit Core)
Tennessee Department of Agriculture (1 Hour in C01, C03, C10, C12)
Texas Department of Agriculture (1 CEU General Pest Factors)
Utah Department of Agriculture and Food (1 CEU in Use)
Washington Department of Agriculture (Credit: Max: 1 Weed: 1)
West Virginia Department of Agriculture (2 credits, categories 1, 11, 12, private applicator)

It is accredited for licensing categories: PCAs, Qualified Applicators, Private Applicators, Aerial Applicators, and County Permit Holders.

CONTRIBUTORS

Our thanks go to the following individuals for information and assistance in developing and/or providing expert review of this course: Brad Hanson, University of California, Davis, weed specialist based in Davis. Curtis Rainbolt, BASF Tech Service Representative and Bill Nairn, a BASF business representative for BASF agricultural products and nutrition in California.

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 (www.plantprotection.org/), 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).