This table is intended to offer the approximate amount of a pesticidal concentrate to be mixed with water to produce sprays for use on the farm and around the home. The desired percentage of active ingredient in the finished spray is obtained by mixing the indicated amount of formulation in 100 gallons of water. The number in parentheses ( ) indicates the amount to use in one gallon of water.
| Formulation | Amount of formulation to use when desired percent of active ingredient in finished spray is: | |||||
|---|---|---|---|---|---|---|
| 0.03125 percent | 0.0625 percent | 0.125 percent | 0.25 percent | 0.5 percent | 1.0 percent | |
| Liquid product containing 1 pound chemical per gallon | 2 pints (2 teaspoons) | 4 pints (4 teaspoons) | 1 gallon (8 teaspoons) | 2 gallons (16 teaspoons) | 4 gallons (10 tablespoons) | 8 gallons (2/3 pint) |
| Liquid productcontaining 1-1/2 pounds chemical per gallon | 1-1/2 pints (1-1/2 teaspoons) | 3 pints (3 teaspoons) | 6 pints (6 teaspoons) | 1-1/2 gallons (12 teaspoons) | 3 gallons (7-1/2 tablespoons) | 6 gallons (1/2 pint) |
| Liquid product containing 2 pounds chemical per gallon | 1 pint (1 teaspoons) | 2 pints (2 teaspoons) | 4 pints (4 teaspoons) | 1 gallons (8 teaspoons) | 2 gallons (5 tablespoons) | 4 gallons (10 tablespoons) |
| Liquid product containing 3 pounds chemical per gallon | 3/4 pint (3/4 teaspoons) | 1-1/2 pints (1-1/2 teaspoons) | 3 pints (3 teaspoons) | 6 pints (6 teaspoons) | 1-1/2 gallons (4 tablespoons) | 3 gallons (8 tablespoons) |
| Liquid product containing 4 pounds chemical per gallon | 1/2 pint (1/2 teaspoons) | 1 pint (1 teaspoons) | 2 pints (2 teaspoons) | 4 pints (4 teaspoons) | 1 gallons (8 teaspoons) | 2 gallons (5 tablespoons) |
| Liquid product containing 5 pounds chemical per gallon | 7/16 pint (7/16 teaspoons) | 7/8 pint (7/8 teaspoons) | 1-3/4 pints (1-3/4 teaspoons) | 3-1/2 pints (3-1/2 teaspoons) | 7 pints (7 teaspoons) | 1-3/4 gallons (4-1/2 tablespoons) |
| Liquid product containing 6 pounds chemical per gallon | 3/8 pint (3/8 teaspoons) | 3/4 pint (3/4 teaspoons) | 1-1/2 pints (1/2 tablespoons) | 3 pints (1 tablespoons) | 6 pints (2 tablespoons) | 1-1/2 gallons (4 tablespoons) |
| Liquid product containing 8 pounds chemical per gallon | 1/4 pint (1/4 teaspoons) | 1/2 pint (1/2 teaspoons) | 1 pint (1 teaspoons) | 2 pints (2 teaspoons) | 4 pints (4 teaspoons) | 1 gallons (8 teaspoons) |
| 15 percent dry product | 1-2/3 pounds (2-1/2 teaspoons) | 3-1/3 pounds (5 teaspoons) | 6-2/3 pounds (20 teaspoons) | 13-1/3 pounds (7 tablespoons) | 26-2/3 pounds (1 cup) | 53-1/3 pounds (2 cups) |
| 25 percent dry product | 1 pound (1-1/2 teaspoons) | 2 pounds (3 teaspoons) | 4 pounds (6 teaspoons) | 8 pounds (12 teaspoons) | 16 pounds (1/2 cup) | 32 pounds (1 cup) |
| 40 percent dry product | 5/8 pounds (1 teaspoons) | 1-1/4 pounds (2 teaspoons) | 2-1/2 pounds (4 teaspoons) | 5 pounds (8 teaspoons) | 10 pounds (5 tablespoons) | 20 pounds (10 tablespoons) |
| 50 percent dry product | 1/2 pound (3/4 teaspoons) | 1 pound (1-1/2 teaspoons) | 2 pounds (3 teaspoons) | 4 pounds (6 teaspoons) | 8 pounds (4 tablespoons) | 16 pounds (1/2 cup) |
| 80 percent dry product | 5 ounces (1/2 teaspoons) | 10 ounces (1 teaspoons) | 1-1/4 pounds (2 teaspoons) | 2-1/2 pounds (4 teaspoons) | 5 pounds (8 teaspoons) | 10 pounds (5 tablespoons) |
Some helpful equivalents
- 1 tablespoon (Tbs) = 3 teaspoons (tsp)
- 1 cup = 16 Tbs
- 1 cup = 8 fluid ounces (fl oz)
- 1 tablespoon = 1/2 fluid ounce
- 2 cups = 1 pint (pt)
- 2 pints = 1 quart (qt)
- 4 quarts = 1 gallon (gal)
- 1 pound = 16 ounces (oz)
- water weighs 8.3 pounds per gallon
Pesticide dilution formulas and examples
Formula 1
To determine how many gallons of emulsifiable concentrate are needed to mix a spray containing a given percentage of active ingredient:
(gallons of spray wanted) x ( percent active ingredient wanted) x (8.3 pounds per gallon)
(pounds active ingredient per gallon of concentrate) x (100)
Example
How many gallons of diazinon 25 percent emulsifiable concentrate (2 pounds diazinon per gallon) are needed to make 100 gallons of spray containing 0.5 percent diazinon?
(100 x 0.5 x 8.3) ÷ (2 x 100) = 2 gallons (rounded off)
Formula 2
To determine how many pounds of wettable powder needed to mix a spray containing a given percentage of active ingredient:
| (gallons of spray wanted) x ( percent active ingredient wanted) x (8.3 pounds per gallon) (percent active ingredient in insecticide used) | = 21 pounds(rounded off) |
Example
How many pounds of carbaryl (Sevin) 50 percent wettable powder are needed to make 100 gallons of spray containing 1.25 percent carbaryl?
(100 x 1.25 x 8.3) ÷ 50 = 20.0 pounds (rounded off)
Formula 3
To determine the percentage of active ingredient in a spray mixture:
(pounds insecticide used) x ( percent active ingredient)
(gallons of spray mixture) x (8.3 pounds per gallon)
Example
Eight pounds of carbaryl (Sevin) 50 percent wettable powder were mixed in 100 gallons of water. What percentage of carbaryl did the finished spray contain?
(8 x 50) ÷ (100 x 8.3) = 0.48 percent