I sprayed my grape vines with an ALL-IN-ONE herbicide-fungicide-insecticide and my leaves turned brown, and died. What did I do wrong?
I have never heard of such a product. Since an herbicide is a substance that kills plants, then spraying it on your grapes would kill it since that is what it is supposed to do. I think you are confused and should go and take a closer look at the packaging….always read and follow the directions on the packaging.