i find they are , adding to moisture at harvest the worst thing,plus spoiling chance of using urea preservative in high moisture grain to save drying when you want to save cost of or dont have a dryer.Not correct
I used to spray garlic to chase off insects and copper for blight
Plus if u dont splash on nitram, weeds are not too much of a problem
and we dont splash on much nitram at all.
copper for potato blight ?