Posted by Paul on June 19, 2017 at 20:12:02 from (66.60.223.229):
In Reply to: Re: Canada Thistle posted by Dave8N in Pa on June 19, 2017 at 17:36:37:
Multiple sprays in a year, with a good fall one works best.
The better sprays like Tordon and the pasture sprays will have a carryover effect, no soybeans or such for a year or two or three after, but they are more effective.
24D will get it done, but is weaker at it. Here are several versions of 24D as well.
The dicambas are a little better than 24D.
Roundup is what worked well for me in crops, I would run a late spray and over a few years they gave up.
But if you are persistant and don't let them feed their roots, you will get them. They like to run sap up to the buds in spring and summer, then run sap to the roots in late summer and fall. If you get the spray flowing to the roots, that helps kill them down faster.
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