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Conversion and Dilution for Fertilizers & Pesticides
Table of Equivalents for Measuring Liquids
- 3 teaspoons or 1/2 fluid ounce = 1 tablespoon
- 2 tablespoons = 1 fluid ounce
- 16 tablespoons = 8 fluid ounces = 1 cup = 1/2 pint
- 16 fluid ounces = 2 cups = 1 pint
- 1 pt of formulation/100 gal = 1 teaspoon/gal
Practical Dilution Chart for Preparing Less than 100 Gallons of Pesticide Spray
| Pesticide | Gallons of Finished Spray* | ||
|---|---|---|---|
| 100 gal | 25 gal | 1 gal | |
| Amount of EC or other liquid formulation to be used | 1/2 pt (1 cup) | 2 fl oz (4 Tbsp) | 1/2 tsp |
| 1 pt | 4 fl oz (8 Tbsp) | 1 tsp | |
| 1 qt | 1/2 pt (1 cup) | 2 Tsp | |
| 1 gal | 1 qt | 2 1/2 Tbsp | |
| Amount of WP or other powder formulation to be used | 1 lb | 1/4 lb (4 oz) | 1/6 oz (5 g) |
| 2 lb | 1/2 lb | 1/3 oz (10 g) | |
| 3 lb | 3/4 lb | 1/2 oz (14 g) | |
| 4 lb | 1 lb | 2/3 oz (20 g) | |
*NOTE: The number of pints/100 is the same as the number of fluid ounces required in 6 1/4 gals.
Amounts of a Commercial Product (Formulation) Needed to Provide Various Amounts of Actual Pesticide per 100 Gallons or per Acre
| Commercial Products (lbs of pesticide per gal of formulated material) |
Pounds of actual pesticide wanted per 100 gallons | |||
|---|---|---|---|---|
| 1/2 lb | 1 lb | 3 lb | 5 lb | |
| 1.5 EC (1 1/2 lb per gal) | 1 1/3 qt | 2 2/3 qt | 2 gal | 3 1/3 gal |
| 2 EC (2 lb per gal) | 1 qt | 2 qt | 1 1/2 gal | 2 1/2 gal |
| 4 EC (4 lb per gal) | 1 pt | 1 qt | 3 qt | 5 qt |
| 6 EC (6 lb per gal) | 2/3 pt | 1 1/3 pt | 1 1/2 qt | 2 1/2 qt |
| 8 EC (8 lb per gal) | 1/2 pt | 1 pt | 1 1/2 qt | 2 1/2 qt |
| 15 WP | 3 1/3 lb | 6 2/3 lb | 20 lb | 33 1/3 lb |
| 25 WP | 2 lb | 4 lb | 12 lb | 20 lb |
| 40 WP | 1 1/4 lb | 2 1/2 lb | 7 1/2 lb | 12 1/2 lb |
| 1% dust/granules | 50 lb | 100 lb | 300 lb | 500 lb |
| 1 1/2% dust/granules | 33 lb | 67 lb | 200 lb | 333 lb |
| 2 1/2% dust/granules | 20 lb |
40 lb |
120 lb | 200 lb |
| 5% dust/granules | 10 lb | 20 lb | 60 lb | 100 lb |
EC = emulsifiable concentrate (liquid) WP = wettable powder
Use of Tablespoons (Dry materials only)
The number of tablespoons per ounce, or cups per pound, of dry insecticides and fungicides varies greatly with different products because some materials are light and fluffy; others compact and heavy. In general, there are from 2 to 6 level tablespoons per ounce of these dry materials.
When a material is to be used repeatedly, it is much better to weigh out the amount needed and place it in some convenient container which can be easily marked. If this cannot be done, it is usually safe to assume that 1 lb per 100 gal is equal to 1 level Tbsp/gal. (For example, Sevin - 2 lb/100 gal = 2 Tbsp/gal.)
Area Conversion
Amount per acre ÷ 43.5 ≈ amount needed per 1,000 sq ft