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Minnesota

I will attempt to expand my patch soon here.. Problem is that I need to convert a Canadian Thistle Patch.. I've heard of long lasting effects of 2-4-D but it seems the most effective combatant against this $#@#% weed.. Patch expansion will encompass approx 50 x 50 feet.. Any ideas?

9/1/2006 1:03:12 PM

Menomonie, WI ([email protected])

HMMM how about sandea, or curbit. We use a combination of the 2 called Strategy. You must start with fresh tilled soil and water in well.

9/1/2006 1:10:52 PM

Ray, North Dakota

Weed and feed? There is 2-4D in that too, but haven't seen much residual. Do it now, and the fall and winter moisture should take care of it if there is residual.

There is weeds in Minnesota?

9/1/2006 2:23:59 PM

Minnesota

Damn Canadians and their thistle!!!!

9/1/2006 2:27:09 PM

Picton,ON ([email protected])

I would use a high dose of Roundup. If you have 2,4-D you can add a small amount to the spray tank just don't over do it as it can reduce the effectivness of the Roundup. Get it sprayed by mid September wait a week, then plow it if you can or at least till it under. Perennials like thistles don't like steel so more fall tillage is better.

9/1/2006 2:31:11 PM

Anamosa, IA [email protected]

I agree with the Roundup or other generic glyphosate herbicide. I would wait until they look good and dead before tilling. If the weather turns cool, it will take longer for the glyphosate to translocate to the roots.

9/1/2006 2:38:10 PM

Little-TON - Colorado

We had them real bad at the nursery and still have more but I have had to hit them 3-4 times with Glyphosate in the heat of the day, did pretty good but they are all over with real deep roots. Then raked up the dead ones as the spines are still a problem.

9/1/2006 2:49:11 PM

[email protected]

There is no "long lasting effect to 2,4-D". Quite the opposite. If 2,4-D is found ALONE & applied in the fall, there will be no residual effect next spring.

The most common problem encountered with any phenoxy herbicide is that of drift. Next is when the ester forms are applied in hot weather & they gas-off onto nearby plants. (Amine formulations of 2,4-D do NOT volatilize at all)

Another huge issue is the fact that 2,4-D isn't very broad spectrum when used alone. So it is usually mixed with Dicamba, MCPA or MCPP to enhance the end results. There is a synergy to mixing herbicides that is not relevant to this thread.

DICAMBA (aka Banvel) is often added to 2,4-D herbicides. DICAMBA is very persistent in soils & is probably where this "2,4-D persistence" myth came from.

9/1/2006 9:39:14 PM

Ontario

Never heard of Canadian thistle. I've heard of Scotch thistle. Is it the same plant?

9/4/2006 1:41:17 AM