Posts Tagged: herbicides

Here Comes Citrus Dry Root Rot

Citrus Dry Root Rot

This impressive tree collapse is most noticeable after rainy season and the first heat waves after the rains

Citrus Dry Root Rot   (July 24, 2019 from 3-4 pm)

Dr. Akif Eskalen, Plant Pathologist, UC Cooperative Extension Specialist, will discuss the symptoms, biology and management of citrus dry root rot. More information to come. One DPR CE unit (other) and one CCA CE unit (IPM) are pending.

Register in advance for the webinars by clicking on the event links above.

 

And if you missed it

Recording of the Management of Weeds in Citrus Orchards webinar is now available on YouTube - https://youtu.be/DU5bpRnq8DI

Dr. Travis Bean, assistant weed science specialist in UCCE, discussed the importance of weed management in citrus, tree age and variety considerations, scouting and weed identification, cultural and mechanical practices, and pre- and post-emergence herbicides.

Upcoming topics:

• Spray technology for tree crops (August)
  
• California Red Scale (September)
  
• Avocado diseases II. (October)
  
• Use of Plant Growth Regulators in Avocado (December)

Register in advance for the webinars by clicking on the event links above.

Are there Continuing Education units?

When the subject discusses pest or disease management, continuing education units will be requested from DPR (1 unit per session).  Participants will pre-register, participate in the webinar and be awarded the unit.  The sessions will be recorded and hosted on this web site for future study.  However, continuing education units will be awarded only to the participants who attend the live version of the webinar.  

Who is involved?

This webinar series is brought to you by Ben Faber (UC ANR Ventura Advisor) and Dr. Beth Grafton-Cardwell (Depart of Entomology UC Riverside Extension Specialist) with the technical support of Petr Kosina (UC IPM Contect Development Supervisor) and Cheryl Reynolds (UC IPM Interactive Learning Developer). 

Into the Weeds

 

Management of Weeds in Citrus Orchards

A One Hour Webinar

June 19, 2019 from 3-4pm)

Dr. Travis Bean, assistant weed science specialist in UCCE, will discuss the importance of weed management in citrus, tree age and variety considerations, scouting and weed identification, cultural and mechanical practices, and pre- and post-emergence herbicides. One DPR CE unit (other) and one CCA CE unit (IPM) are pending.

Register in advance for the webinar by clicking on the event link above.

And there are more coming:

https://ucanr.edu/sites/ucexpertstalk/

 

weeds

Glyphosate Resistance in Orchards

There has been a good overall discussion of herbicide resistance found in plants and how they can affect orchard management.  Check out this presentation by UC Cooperative Extension Weedologist, Brad Hanson, in the "past Webinars" section:

https://ucanr.edu/sites/ucexpertstalk/

And read more about glyphosate resistance in orchards:

hairy fleabane 1

The Round UP on Glyphosate Use in Tree Crops

UC Ag Experts Talk:

Managing Glyphosate-Resistant Weeds in Orchard Crops

Description: One hour webinar about glyphosate-resistant weed management in orchards, delivered by Dr. Brad Hanson. One CEU (other) from the DPR is approved.

Time: Apr 24, 2019 3:00 PM in Pacific Time (US and Canada)

Recorded version will be published on UC IPM YouTube channel about a week after the webinar.

The link to register is https://ucanr.zoom.us/webinar/register/WN_96wd2GBMQl2Ou4i4oSwTTg

More information about the webinar series UC Ag Experts talk: https://ucanr.edu/sites/ucexpertstalk/

Speaker

horseweed bolting

Italian Ryegrass Resistance to Herbicides

WESTMINSTER, Colorado - November 23, 2018 - Herbicides have been instrumental in managing Italian ryegrass, a weed that frequently competes with perennial crops in California. Herbicide-resistant populations have become increasingly commonplace, though, including paraquat-resistant Italian ryegrass found recently in a California prune orchard.

A team of scientists set out to determine if the paraquat-resistant population might also be resistant to other postemergence herbicides. Seven other herbicides commonly used in fruit tree and nut tree crops were included in the study, including clethodim, fluazifop-P-butyl, glufosinate, glyphosate, pyroxsulam, rimsulfuron and sethoxydim.

Researchers found the paraquat-resistant population was also resistant to both clethodim and glyphosate. Among the remaining herbicides, glufosinate, rimsulfuron and sethoxydim were found to deliver the best postemergence control. Unfortunately, though, other populations of Italian ryegrass have developed resistance to the three herbicides, indicating their effectiveness may be short-lived.

"Overreliance on postemergence herbicides from a variety of chemical classes can result in weed populations that exhibit multiple resistances," says Caio Augusto Brunharo, a postdoctoral research fellow at the University of California, Davis. "Effective herbicide-resistance management programs are necessary for sustainable weed control."

The researchers recommended a number of preemergence herbicides as control options for Italian ryegrass in fruit and nut tree crops, including tank mixes containing indaziflam and flumioxazin.

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Full text of the article, "Multiple Herbicide-Resistant Italian Ryegrass (Lolium multiflorum) in California Perennial Crops: Characterization, Mechanism of Resistance and Chemical Management" is now available in Weed Science Volume 66, Issue 6.

About Weed Science

Weed Science is a journal of the Weed Science Society of America, a nonprofit scientific society focused on weeds and their impact on the environment. The publication presents peer-reviewed original research related to all aspects of weed science, including the biology, ecology, physiology, management and control of weeds. To learn more, visit http://www.wssa.net.

italaian ryefrass resistance

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