Does he have a native grass stand? The alfalfa is probably thining out and being replaced by the kochi a. If the grass out competes kochi a how did it get started in the first place.
I think kochia is an annual, check with your local agronomist you might be able to control it with a preemergence herbicide.
Ah better living through chemicals.
At the time we bought the property in 2000, this was a corn field. We seeded it down to Western Wheat grass with a strong dose of alfalfa. The theory was to give the pheasants and deer a place to live and feed in the winter time, as it was the only alfalfa around. Within a year, the adjoining landowner took the remaining acres and planted alfalfa also, which he hays a couple times a year. Our alfalfa, which did not get hayed regularly, turned rank in the late season, nothing but sticks. We opted to redo it, since there was alot of adjoining alfalfa and our was not needed for wildlife forage.
We used Milestone and killed out the alfalfa, about 6 years ago, and the wheatgrass is doing well. The alfalfa in the pictures, is just residual plants that have sprouted from seed, or missed in the chem app.
I like the diversity in the field right now with a little alfalfa, and more grasses. I'm trying to integrate more WSG into the mix, becausey the Wheatgrass came as a recommendation from a supplier in Pierre, and I dont think I would use it again, at least not in the quantity I have now.
This is just a small stand, but holds birds, and deer feed in it regularly. We dont hunt it, but will take the dogs thru it occasionally. Its more for viewing pleasure.
I actually just discovered the Kochia on the south end during a short walk with the pup last weekend. I guess if you cant see it, it shouldnt bother me..)