MarkB_MI

Well-known Member
Location
Motown USA
I've got a small infestation of Colorado Kudzu. I think it was introduced via a woodchipper some tree guys used to chip branches on our place. Regardless of the source, it grows well everywhere the wood chips were spread.

Last year I knocked it down with Roundup, but it came back with a vengeance this summer. This time it's all-out war. Following the advice of the aggies at Colorado State, I've been hitting it every week with Weed-B-Gone Crabgrass Control (2,4-D + quinclorac). Each week the new shoots are fewer and further apart. Interestingly, all the new growth is at the periphery of the patch, so I think the herbicide is doing its job and killing the main roots of the patch.

The edge of the patch is within ten feet of the neighbor's fence. His side of the fence hasn't been cleared in fifty years, so if the bindweed makes it to the fence the battle is lost.

Any thoughts about how to deal with this charming ornamental?
What the aggies say
 
Is this in your yard or pasture??? It makes a big difference in what products are labeled for your use. The trouble is your spraying contact herbicides. You need a product that has residual action to control the roots and new seedlings. The 2+4 D is what is killing the bindweed/Kudzu. The quinclorac is just a selective grass killer. It does nothing on a broadleaf weed.

IF you where in a pasture or hay field I would say use Grazon or even a low rate of Atrazine. These both will have a residual effect on broadleaf weeds. IF your in a yard then these products are not labeled for that use.
 
JD, it's in my yard at the edge of the grass. I don't want you use anything that will kill grass, since I think the lawn will crowd it out, given a chance.

As for the quinclorac, that's what Colorado State recommends for bindweed control in lawns.
 
Put deep lawn edging or a sheet metal strip a foot wide at the edge of the patch, or fence. Does the bottom of the trench to discourage root growth under it. Then kill it off at your leisure. Jim
 
Mark I read the label on the quinclorac and it just talks about grasses controlled. The bindweed your dealing with is more of a broad leaf. If you know any farmers I would see if any of them have some Grazon. It will not hurt your grass but does have Tordon in it, which will kill brush and broad leaf weeds.
 
Use ammonia nitrate or what ever is substituted in your area at a rate of 600# per acre or if a small spot you want the granules about a half inch apart then use a lawn sprinkler on that spot daily keeping it wet . The grass will grow and 2-4D will kill the weed .
 
JD, another source, Utah State University, has this info:

"Of the chemical control options available, recent research from weed scientist Richard Zollinger and others from the University of Minnesota suggests that products containing Quinclorac offer superior control. They obtained 99 percent control after 1 year of use. After 3 years and no further applications, the bindweed was still controlled at the 90 percent level."

Now, saying your bindweed is 99 percent under control is sorta like your doctor telling you you're "99 percent cancer-free". Still, it seems there's some consensus that quinclorac is effective against bindweed.
USU bindweed control PDF
 
If it's anything like the kudzu we have in the south you had better forget the grass and kill it any way you can. Once it takes hold nothing short of a nuclear bomb is going to eradicate it and I'm not positive that will work. You can cut a stem or piece of root, let it sun dry above ground for a month and it will still grow when it makes ground contact.
 

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