Dave8N in Pa
Member
Anyone care to tell me the best way to get rid of Canada thistle?
- Thread starter Dave8N in Pa
- Start date
Aaron SEIA
Well-known Member
Repeated spraying with something labeled for them. Cutting and tilling only spreads them. If you prefer organic, then a 50,000 btu propane torch and repeatedly burn them.
AaronSEIA
AaronSEIA
Dave8N in Pa
Member
Thanks Aaron, I've been reading about it and I understand it's long term thing. Which spray is best? 24-d in the fall?
CLYDE MASON
Member
- Location
- connersville, ind
millstone ot trainline
fixerupper
Well-known Member
I mow them, then in a month or so I will spray the regrowth. Grazon is what I've been using lately, it's a mix of 2-4D and Tordon. A few will come back next year so you get to do it all over again but if you do a good job the second time they won't come back again. This spring I nailed a few when they were small. If they are making seed heads you should mow them and let them grow back. Best time to spray the regrowth is after the first frost if you have frost in your neck of the woods.
FormerlyPaMike
Member
Crossbow works well. As does MSM (Ally). 2,4d will work but not as well.
Michael Soldan
Well-known Member
Canada Thistle has a waxy leaf and you need a surfactant to make your weed spray work effectively. Dish soap is the cheapest and easiest,add a shot to you sprayer and the spray will stick to the leaf better and a film will appear which holds the chemical on the leaf for a good kill
My wife and I always used 2-4-D middle of May. You wanna get them before they bloom. They're like mushrooms. If you see a few look down and you'll see young ones. My wife would sit on our 3-pt platform while I drove the IH 574. I had our 50 sprayer on there with her and a short boom underneath which I could turn off and on. She had the hand gun for the fence rows and taller ones. When we got to a large amount of thistles we called them Colonies. It took us 3 years to wipe them out. I love spraying weed killer. My wife says I'm spray happy.
bradley martin
Well-known Member
Lontrel (clopyralid) is very effective on thistles. It is pricey, but works very well.
casecollectorsc
Well-known Member
- Location
- E central SD.
Sterling Blue and 2-4D will toast it.
Bob Harvey
Well-known Member
You can start calling it by it's right name - Scottish Thistle. Came over in some axxwholes kilt. -- yes he had steel ones.
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.
Paul
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.
Paul
Grazon at 1.5 pints/acre in 10 gallons of water. I used Grazon last fall in a real Canada thistle patch and I could not find a thistle I the area I treated. Lot to be said for fall spraying. You can also use Milestone but it is spendy. If you want to really get rid of thistle, spray in the fall after the first frost. Otherwise you can use 2,4,D + dicamba (Weedmaster, Rangestar, etc) and hit them in the spring at 1 pt/acre in 10 gallons of water. They"ll knock it down but most will be back the following year.
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