2018 Crop Protection Guide for Tree Fruits in Washington

General Recommendations

Tuesday, December 11, 2018

Spray Gallonages

Definitions for spray volumes vary throughout the United States. Extension entomologists in the western states have agreed on the following definitions for orchard spraying: Dilute (High-Volume Spray)—350 to 800 gallons per acre. Semi-Concentrate (Mid-Volume Spray)—100 to 350 gallons per acre. Concentrate (Low-Volume Spray)—10 to 100 gallons per acre. Extra High Concentrate (Very Low Volume)—0.5 to 10 gallons per acre. Ultra Low Volume—4 ounces to 0.5 gallon per acre, undiluted material.

Tree size is a major factor in how wet the leaves and fruit become when sprayed. The definitions above relate to relatively large trees.  Lesser gallonages on smaller trees may wet the trees to a level similar to the definitions above.

Dilutions for Wettable Powder and Liquid Products

  Quantities of Material For Indicated Quantities of Water
Type of Material 100 Gallons 5 Gallons 3 Gallons 1 Gallon
Wettable Powder 5 pounds 4 ounces 2.40 ounces 0.80 ounces
4 pounds 3.2 ounces 1.92 ounces 0.64 ounces
2 pounds 1.6 ounces 0.96 ounces 0.32 ounces
1 pound 0.8 ounces 0.48 ounces 0.16 ounces
0.5 pound 0.4 ounces 0.24 ounces 0.08 ounces
 
Liquid Products 3 gallons 1 pint, 3 oz 11.5 ounces 7.5 tablespoons
2 gallons 13 ounces 7.5 ounces 5 tablespoons
1 gallon 6.5 ounces 4 ounces 2.5 tablespoons
1 quart 9.5 teaspoons 5.5 teaspoons 2 teaspoons
8 ounces 2.5 teaspoons 1.5 teaspoons 0.5 teaspoon
4 ounces 1.25 teaspoons 0.75 teaspoon 0.25 teaspoon
The weight per volume of dry formulated products varies. To ensure accurate dilutions, measure these products by weight only. NOTE: 1 fluid ounce = 29.6 milliliters. 1 ounce weight = 28.3 grams. 1 teaspoon = 5 milliliters. 1 fluid ounce = 29.6 milliliters.
Tree Fruit Research & Extension Center, 1100 N Western Ave, Washington State University, Wenatchee WA 98801, 509-663-8181, Contact Us