UCCE Master Gardeners of San Joaquin County
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UCCE Master Gardeners of San Joaquin County

Posts Tagged: horseweed

Will climate change affect the sensitivity of weeds to herbicides?

Translocation of glyphosate

Herbicides are the main means of controlling weeds. Recently, there has been increasing concern over the potential impacts of climate change, specifically, increasing temperatures and elevated carbon dioxide (CO2) concentrations, on the sensitivity of...

Posted on Monday, September 10, 2018 at 7:55 AM
Tags: Climate Change (5), glyphosate (31), herbicide (61), horseweed (7), lambsquarter (1), weed (25), weed control (79)
Focus Area Tags: Agriculture Pest Management

And Now Paraquat

52268 original

A recent call about the poor control of marestail (horseweed, Conyza canadensis) to glyphosate (Roundup®) wasn't surprising, but that paraquat didnt do the trick was.  It turns out that there is multiple resistance to the materials. ...

Posted on Monday, June 4, 2018 at 8:00 AM
Tags: avocado (4), citrus (30), fleabane (2), hairy (1), herbicide (61), horseweed (7), marestail (4), pesticide (14), resistance (6)
Focus Area Tags: Agriculture

You see it here, You see it there--that elusive Hairy Fleabane everywhere

Conyza sidewalk

Here's the latest from the UC ANR Topics in Subtropics blog written by Ben Faber, Farm Advisor, UCCE Ventura County.   It really has gotten out of hand--Hairy Fleabane and Horseweed which are both Conyza weed...

Posted on Sunday, August 20, 2017 at 9:00 AM

Horseweed resistance

Conyza (young)

From the Topics in Subtropics blog ∴ June 15, 2016 Researchers have now confirmed that six glyphosate-resistant weed species have been identified in California. Four have been known to exist for some time; they are horseweed (marestail,...

Posted on Wednesday, June 22, 2016 at 5:00 PM

What is that in my grove, Horseweed or Hairy Fleabane?

Photo 2. (Right) Seedlings of hairy fleabane (top) and, horseweed (bottom). (Photo: Shrestha et al. 2008).

As a farm advisor many growers will ask, “What is that in my grove- horseweed or fleabane?” These two weeds have been running rampant in Southern California, as well as other parts of the state and can be seen in every cropping system...

Posted on Wednesday, January 27, 2016 at 11:45 AM

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