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

Posts Tagged: marestail

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

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

Herbicide resistant weeds in your neighborhood

Young plants of hairy fleabane

From the Topics in Subtropics blog :: July 5, 2013   It is not always easy to kill weeds with herbicides for several reasons, but if you apply the right material at the right time to susceptible weeds you expect control. But you should never...

Posted on Thursday, March 20, 2014 at 7:50 AM
Tags: glyphosate (31), hairy fleabane (8), herbicide (61), horseweed (7), marestail (4), resistance (6), weeds (64)

Options for Controlling Marestail and Hairy Fleabane in Vineyards

Marestail (Conyza canadensis; aka horseweed) and hairy fleabane (C. bonariensis; aka flax leaf fleabane) are serious weed problems in vineyards in Monterey County.  Both plants are summer annuals that germinate in the fall at the onset of the rainy...

Posted on Monday, December 17, 2012 at 12:24 PM
  • Author: Richard Smith
  • Author: Larry Bettiga
  • Author: Brad Hanson
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