canada thistle

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Easy? There isn;t one. They are a 2 year plant, you gotta get the rosette the first year before it bolts and goes reproductive. If you cut the stalk and spray the remaining plant with 2,4-d, or cut off as much of the stalk as had floor buds and spray with 2,4-d, that will keep them from spreading seed. But you still have to get the rosettes the first year. I've had as good luck with 2,4-d as I have with roundup and it doesn;t kill the grass around them.

dun
 
LaneFarms":e1d0vbe8 said:
Does anyone have an easy way of controling Canada Thistle. I spot spray every year with round-up and it still keeps popping up.
Click to expand...

My Dad always had good results with a shovel. Mind you it's manual labor. :) Along in May we most years have some wet weather here. He'd put the shovel point at an angle to cut the root about 4 inches below the surface. Didn't have to remove the plant. Just shear the tap root. He was home all the time and had plenty of time to do this. I spot spray with crossbow. :lol:

Don't think we'll ever get rid of it though. Those little fuzzy seed thingys float a long way when the wind is blowing. So I thank the folks to the west of me for a good supply of thistle each year. :roll:
 
The nasty thing about Canada Thistle is that it will invade perfectly healthy stands of tame vegetation and completely wipe it out creating a dense city of thistle. Its rhizomes can go 5 feet into the ground and this is why cultivation is ineffective and destroying the seedhead does nothing to slow down its regenerative power. ( although yes it will keep the seeds from blowing to the neighbours and beyond) Round up is supposed to be absorbed into the deep roots completely killing the entire plant BUT I find it usually bounces back the following year. I did some spot spraying with Grazon a couple years ago in some pasture areas...So far I have a 3 year control but I don't expect it to last forever. I need to win the lottery to spray all teh thistle patches I own. :x
 
I was at a conference once and heard of a parasite that will help control thistles... I never researched it, but I trust the source... Apparently its a worm type of thing that will eat the seed head out. It wont kill the existing ones but will control the spread of seed, and they should stick around as long as you have thistles on your land.
 
I've used something called Redeem from the local county extention agent... kills them dead and most of them don't come back the next year.
 
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lukem86":1oo34h4k said:
I was at a conference once and heard of a parasite that will help control thistles... I never researched it, but I trust the source... Apparently its a worm type of thing that will eat the seed head out. It wont kill the existing ones but will control the spread of seed, and they should stick around as long as you have thistles on your land.
Click to expand...

If you have them you'll see the flower isn;t comletely opened up and thefloor will appear a whitish or greay color.
The problem is that there are only so many of htem and a lot more flowers. Ma Nature rarely allows any species to completly eliminate ti's host. They will help make a dent but they aren;t going to iradicate the thistle. We frequently see half of the flowers on a plant will have the larvae in them andthe other half will continue to grow, flower, and spread the seed. The bug looks like a weevil. A flower that they've gotten into will have one or more small, about the size of a grain of rice, white colored worm in them. That's the larvae.

dun
 
I have had great luck with a spray called "Curtail", I think Dow makes it (not sure) but made by the same company that makes "Crossbow" the best blackberry control out there. I talked to an extension agent a few years back and he said that Canadian thistle mostly spreads via it's root system, but also goes to seed. Had alot of it 4 years ago and now it's mostly gone, thanks to lots of spraying, less and less each year.

Alan
 
Our Herfs love the stuff and graze it along with most of the other weeds. The plants that are not in the pasture get chopped, takes a couple of years for the seeds to stop growing.
Need to kill the plant before it seeds.
DMc
 
I'm surprised no one on this board has metioned Grazeon. I've been using it for quite a few years. It is basicly a combination of 2-4-D and Tordon. The probelm with 2-4-D is it will burn the plant down but won't kill the roots. That is where the Tordon comes in. We have quite a time with Musk Thistle. Grazeon kill it easy in the bolt stage. It will get Canada also but you will have to apply a higher rate. You will also have some residual with this spray for about a year. The only draw back it will kill your clovers
 
Why do the call it a Canada thistle?? You guys up north have it out for us guys in the State's???? :D :lol: :D
 
Susie David":ko09rkh6 said:
Our Herfs love the stuff and graze it along with most of the other weeds. The plants that are not in the pasture get chopped, takes a couple of years for the seeds to stop growing.
Need to kill the plant before it seeds.
DMc
Click to expand...

Susie David, My cows won't even graze close to it. I've heard of short mouth and broken mouth cows but your's must be "tough mouth" cows. :lol:
 
When we bought our place it was covered with Canadian Thistle, about 10 acres of them. The county made the previous owner spray them just before we signed the papers on it. I was there when the company came out to spray them and talked to the applicator. We had always sprayed them in Sept. and this was Aug. He used Curtail and said it would work. It'be been 12 years now and we only have a few small patches.

Bobg
 

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