Posts Tagged: horseweed

And Now Paraquat

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.  If horseweed is resistant to glyphosate...

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

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 species that have run rampant this year...

Horseweed resistance

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, Conyza spp.), hairy fleabane, rigid ryegrass and...

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

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 imaginable. Their population numbers can be...

Herbicide resistant weeds in your neighborhood

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 assume it, because resistant weeds rely on this...

Read more