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Corn Speedwell - how to kill!!!

5K views 4 replies 2 participants last post by  RigglePLC 
#1 ·
This is by far the biggest enemy I come across. I recently sprayed with a 3-way and triclopyr mix. 3oz/gal of triclopyr and 2oz/gal of 3way. Needless to say they aren't really phased. I see a couple here and there showing a couple brown spots but no real signs of being affected at all. Any help would be appreciated!
 
#3 ·
Veronica (speedwell) is a very difficult weed.
I think it is a winter annual. I think you will have good luck if you spray thoroughly in the fall.
Probably about 2 weeks before, to two weeks after your first frost.

Experts at our local university suggest quinclorac, in addition to a three way.

Or spray in hot weather--when it is about to die anyway.
http://www.msuturfweeds.net/details/_/creeping_speedwell_2/
 
#5 ·
The limit on 2,4-D is twice per year if you are spraying overall, blanket spray. So, after two weeks, best to stay with a spot spray--so you can use three-way again in fall. Add quinclorac (Drive)--as the university suggested. Surfactant? Sure--why not.
However, my test last year found no benefit to surfactant on most weeds. In a spot spray situation however, surfactant cost is minimal.

Don't go overboard and apply excess. And remember, three ways include dicamba--which can damage trees by root uptake. Not sure--I think redbud and linden are more sensitive than most.
 
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