Here is what we have found with hay and grazing pastures, I am sure it would also help with your wheat!
Anything grown Organicly has a higher sugare content. Armyworms can not stomach sugar, it causes gas in thier system and they can not pass gas up or down out of thier system so they literally blow up inside.
I have seen this for years now. My fields as well as my customers fields have never been wiped out from armyworm. You see a little damage here or there, where the moth laid the eggs, around oak trees and around the perimeter of the pasture. But that's it.
We are also Applying Galic Spray with the Foliar Fertilizers, so that the garlic becomes systemic in the pant. This helps with other leaf eating insects but does not harm the Benifitial Insects. The animals love the garlic, and it does not pass on a garlic taste to any fruits or vegi's.
We recently had a customer with a 1,500 acre ranch that had armyworms pass thru the area and they had less than 10 acres of damage, and that was mostly in the bottom area, and they ate water grass?
The cost is very reasonable, usually around $9.00 to $12.00 per acre if you apply it yourself.
As far as weeds? We have found that the healthier the ground the less weeds you have. If you were to study the weeds instead of kill them they are trying to replace nutreints in the soil. When the soil is healthy and blanced the weeds tend to go away. We do see new weeds pop up when we disturb the soil. My old time farmers in this area call it "new ground" and say thats the price you pay when you work the ground. In the past when I use to spray herbicide for weeds, I would see the same weed come back the next year on customers properties, plus I was killing mostly lagumes. On the customers that were competely Organic they would have less and less weeds and more and more lagumes each year. So that sold me, We stopped using herbicides an pesticides.
Let me know if you have anyother questions,
We manufacture and sell Organic Fertilizer Products. We specalize in Hay and Grazing Pastures. We also grow and sell Oranically Grown Horse Quality Coastal and Clover/ Coastal Hay. 903 858-2030