Through exposure over time to herbicides, some weeds can become resistant to the modes of action of particular herbicides.  These weeds can thrive, spread and dominate if other weeds are controlled and provide no competition to resistant ones. 

Dr. Daugovish has provided some guidelines for managing herbicide-resistant weeds and avoiding practices that can allow them to proliferate.  These include identifying the weed species, using mechanical weed removal methods, getting them early, and monitoring the herbicide efficacy after application.

If you are interested in learning more about this, please see the entire article here.  You can visit the Farm Bureau website at http://www.farmbureauvc.com/.

Produced by UC’s Statewide IPM (Integrated Pest Management) Program, Retail Nursery and Garden Center IPM News is designed to educate retail center operators and their customers on how to solve pest problems while minimizing risks to people and the environment.

The current issue features:

• Managing powdery mildew on ornamentals
• Asian citrus psyllid update
• Mushrooms and other nuisance fungi in lawns
• Preliminary report on Iron HEDTA: A natural selective herbicide
• National Pesticide Information Center: A good source of pesticide information for your customers

You may subscribe to the newsletter, read back issues, or contact authors by visiting this page of UC IPM Online.

UC IPM resources for retail nurseries and garden centers provide help to this segment of the industry in solving pest problems while minimizing risks to people and the environment.

A new addition of UC ANR’s Topics in Subtropics newsletter has posted to our website. This is a collaborative effort from UC researchers throughout the state, written for commercial producers.

Newsletter content includes:

• Vertebrate damage
• Chemical thinning of olives
• Tips on producing the earliest early citrus in the San Joaquin Valley Herbicide registration chart
• Resource and market information for enterprise selection.

To view previous issues, or to subscribe to any of our newsletters, please see this page of our website.

As of September 2011 California has approximately 30,000 acres of olives are in production. California olive oil production has doubled since 2008.

Written for pest management professionals and pesticide applicators the UC IPM Green Bulletin shares resources and research to benefit these groups. As is often the case with UC resources, while they might be designed for specific groups, others may also benefit and gain knowledge.

The new edition of the Green Bulletin contains the following articles:

• Natural Herbicides: Are They Effective?
• NPIC: A Good Source of Pesticide Information for Your Customers
• Alternative Turf Demonstration Project
• UC IPM Offers new Free Online Courses
• Ask the Expert!

Current and back issues of the Green Bulletin can be found on this page of UC’s Integrated Pest Management site.

UC researcher taking notes at turf research plot. Photo by Jack Kelly Clark.