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| Whatever you do, make sure you get it before it goes to seed up to 500,000 seeds per head. And mix up the herbicides, so you aren't applying the same class of herbicide so it can create resistance to that class of herbicides. there are already varieties of waterhemp that are resistant to 6 classes of herbicides. It has to cross breed so it also evolves quickly.
also try to verify it is actually waterhemp and not another related species, they are easily mixed up when they are young and can be intermixed in a stand.
https://extension.missouri.edu/media/wysiwyg/Extensiondata/Pub/pdf/m...
As a last resort, you could walk the field. The seed is viable for 4-5 years, you pretty much have to plan on eradicating it for the next 5 years. It is a nightmare.
Trying to control water hemp after it has emerged and is more than a few inches in height is extremely difficult to do. The best method of control is a two pass system with a residual on both passes.
You might look at cover cropping.
https://practicalfarmers.org/2019/02/taming-the-waterhemp-beast/
I would also be careful about spraying insecticides on it, certain species of carabids (ground beetles) eat small seeds, but they don't multiply that fast. And mice also eat them. A cover crop may also provide a habitat for critters that eat the seeds. One trial had a 30% more weeds without ground beetles.
The bottomline, is you are going to need a whole strategy that includes multiple methods to eradicate it. And you have to eradicate it. | |
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40” tall corn… what to do
