Grapeman speaks the truth. You have to get the right amount of fungicide applied. The water is just the carrier. Don't pick how much water you are going to spray, and let that determine how much fungicide you apply. Instead, flip that around and decide how much fungicide to spray, and let that determine how much water you need (while staying within the manufacturers suggested mix ratios)

I put this spreadsheet together to help me remember how to mix my tank. Manzate and Ziram list min and max water carrier amounts per acre. I mix on the thick side using a 4 gallon Hudson SP2 backpack sprayer.

For example, I mix 9.6 oz of manzate in my 4 gallon sprayer, a little more than 4x what you are doing. My vineyard is about 1/5 of an acre. I spray until my backpack is empty. My GDC rows get a couple passes.

Code:

```
Water per acre | Water per vineyard
Product per acre unit min water max water | fungicide/vineyard min water max water
Manzate 3 lbs 20 gal 100 gal | 9.6 oz 4 gal 20 gal
Abound 12 oz | 2.4 oz
Rally 4 oz | 1.0 oz
Ziram 4 lbs 20 gal 100 gal | 12.8 oz 4 gal 20 gal
```

**Opinion** The recommended rates do not take into account 3" shoots verses 6 ft shoots. Not that I can tell anyway. I don't apply the full 9.6 oz of manzate when shoots are just emerging. Doing so would require that I go over the same area 4 or 5 times. I spray until it looks and feels right, then call it good.