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How do you kill thistles.

L

lemroy

Member
Some of my pasture is overrun with thistles. I am brushhogging them at present but I am sure they will be back next year. Will 24-d kill them permanently? Roy
 
lemroy,

I spray Canada Thistle once or twice a year with 2,4-D. The plants begin wilting almost immediately, but they're back every year.

I don't know what is a good, permanent solution for them.

Tom in TN
 
Not always possible but if you want to kill them, Mow them down while it is pouring rain or drizzling steady. If they get water down there pipe there DEAD. I rolled them in a 3 inch in 24 hour rain once in a pasture and it took years for them to come back.
 
There is a product called Grazon (brandname)I do not know the chemical name at this time. My local farm store carries a knockoff. This works well on thistles and woody brush. I believe it is a mixture of 2-4-D,and Tordon. It does not bother grass, and can be grazed immediately. This works for me
 
tordon is only known killer, that gets the roots! fall spraying is the best time frame!

roundup does a good job but kills everything around them also. if they get a sniff of 24d; they shut down and won't take any poison down to the root system!
 
Milestone will take care of any broadleaved weed especially thistles. You can spray pasture and graze it immediately.
 
I use forefront. It does a good job. It has 24D in it but other stuff as well. If I spray them in the morning I can go back after lunch and get the ones I missed.
 
I just killed some using roundup. I have a 3pt sprayer with a wand added. I just drive up beside one and spray about an ounce directly on the bloom portion. If you allow it to bloom white, you are fighting a losing battle. Catch them early and kill them and each year there will be less and less. I am down to just a few here and there
 
A chemical called Stinger works the best and doesn't kill grass I have used it in corn fields and they never came back
 
I suppose it depends on what thistle it is exactly.... but I find that Canada and Scotch thistle can both be readily killed off by mowing at the correct time. Hit them just before they bloom and again the same summer if necessary... that breaks their cycle and depletes their root reserves such that they don't survive the winter. We had acres of pasture over run with both and one summer of mowing 10 years ago wiped them out and they haven't been back since. Again, timing is IMPORTANT. DO NOT allow them to bloom.

Rod
 
The secret to Canadian thistles is to kill the root.

Milestone Grazon, Tordon, roundup all will work.

Takes more than one application to get the whole patch and anything you so in spring only burns the top off. Doesn't affect the root much.

In fall or late summer, the plant has the juice flowing down to feed the root, and any spraying then will do a whole lot more to kill them off.

Paul
 
Grazon +PD Use it in mid june to kill plant and keep it from blossoming and spreading seeds. Then spey again in mid Sep when the roots are rejuvenating from the plant. Roots suck the poison in. Apply at a little over a qt per acre, 10 gals H20/mixture per acre
You need license for Grazon
 
Grazon. Spray in the spring before the thistles set seeds or wait till august, mow the thistles, wait till mid September till the regrowth is nice and lush and spray them. You might need to spray a second time the next year. I had Canadian thistles pretty bad in CRP seeded to brome and a couple shots of Grazon cleaned them up. The Tordon in Grazon stays in the soil for a few years so growing soybeans during those years won't work. I used 20 GPA of water for the carrier for good coverage. Make sure your sprayer is well calibrated first. Jim
 
Grazon or Hired Hand P+D. Picloram (brand name Tordon) and 2,4-d.
We spray all summer, sprayed a pasture that was picked up last year in October with my LBOE mix. Always find more that weren't up the first time through.
 
Thanks all you techs. I have brushhogged the area. I will apply some weed killer next. Hope that works. Roy
 
It can be done with 24D or RU, but timing has to be nearly perfect, otherwide it is a several applications/year and multiyear process. You just continue to thin them out. Miss a couple of applications and you regress really fast. Tordon or Grazon (Tordon and 24D) will do the job and timing isn't as critical.
 
Lots of good information on how to kill them. Back in the late 50s and early 60s My dad would send ME out with a crummy pair of hedge trimmers. You want to try that guys! The only few I have seen around lately I went out with my razor sharp MACHETTE!!!! THAT was fun!!! Took my revenge on those bas..t#$ erds.. HAHAHA {crazy laugh}. Jeffcat
 
If you use roundup, it kills everything, leaving bare ground where the thistle seeds have a holiday, germinating with no competition. Use a herbicide that kills the thistles but leaves the grass to shade out the weeds. Bare ground is heaven for weeds. Heavy grass turf is their enemy.
 
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