What will kill this?

Got this weed growing and roundup will not kill it. Got any suggestions I have not tried crossbow but was thinking about it.20190713_072223.jpg

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A North Korean nuke would kill it....;)

That's marestail, and it depends on the extent of herbicide resistance it has built up in your neck of the woods. It is resistant to gly in most areas of the country where no till farming is being used extensively (what doesn't kill you makes you stronger).

I've killed it with Crossbow in my area, and that would likely work for you if you hit it when its young.

Here is something else. It's an annual and has to come back from seed. Let it go until a couple of weeks before the seed become viable and mow it. It can't come back in time to make more seed. However, if you mow it too early, it will adapt and make seed on a low stalk.

Good luck....
 
A North Korean nuke would kill it....;)

That's marestail, and it depends on the extent of herbicide resistance it has built up in your neck of the woods. It is resistant to gly in most areas of the country where no till farming is being used extensively (what doesn't kill you makes you stronger).

I've killed it with Crossbow in my area, and that would likely work for you if you hit it when its young.

Here is something else. It's an annual and has to come back from seed. Let it go until a couple of weeks before the seed become viable and mow it. It can't come back in time to make more seed. However, if you mow it too early, it will adapt and make seed on a low stalk.

Good luck....
Crossbow (ester formulation) or Aquasweep (amine formulation) are really good on hard to kill broadleaf. I’ve never seen marestail as bad in Oklahoma as it is this year. The stuff is everywhere. At this point in the season just about anything is going to be hard to kill though.
 
80% of Horseweed (marestail) emerges in fall and overwinters to get an early start in the spring, but it's primarily a weed in no-till systems like soybeans, and driveways and waterways& other edges that don't get mowed often. One horseweed plant produces 200,000 seeds that can go long distances with the wind, and infest your entire farm, and the seeds can stay dormant for 20 years if buried. However, almost all seeds on top of the ground will germinate in the first year and it's controlled by tilling, mowing, and easily controlled in the rosette stage with herbicide, but is difficult to control once the plants begin to bolt, Tilling in the spring and planting in mid-May will help control horseweed, and small grains and corn suppress horseweed because it isn't shade-tolerant. My go-to herbicide is 2,4-D, this does a good job on it in the rosette stage.
 
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