I usually have to use 3 gallons so I just put in 16 oz after I have filled the sprayer up with 3 gallons of water. It is a four gallon backpack sprayer but four gallons is just a bit too much to deal with. I have too many obstacles to step over and around.
Using half strength probably won't do much good. Respray with the correct mix. I learned when I was experimenting with it years ago that I would lose a plant faster where I was using a solution that was too weak much faster than one where the solution was a bit too strong. The plants usually recovered from some leaf burn but once a disease got all over it there was no hope.
Bill
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