What do pesticides labeled as 1.5 EC and 90 DF generally indicate?

• A. 1.5 gallons and 90 lbs of active ingredient
• B. 1.5 quarts and 90 ounces of active ingredient
• C. .5 lbs per gallon and .9 lb of active ingredient
• D. 1.5 pints and 9 quarts of active ingredients

Answer: (C)

The designation of pesticides as 1.5 EC and 90 DF refers to specific formulations and concentrations of the active ingredient in those products. The "1.5" in 1.5 EC indicates that there are 1.5 pounds of active ingredient per gallon of the concentrate, which is a common way to express the concentration in emulsifiable concentrate formulations (EC).

The "90" in 90 DF signifies the product is a dry formulation, specifically a dispersible granule or dry flowable (DF), containing 90% active ingredient by weight. It implies that if you had 100 pounds of this product, 90 pounds would be the active ingredient.

Thus, while 1.5 EC indicates the amount of active ingredient per volume in an emulsifiable concentrate, the 90 DF indicates a high concentration of active ingredient in a dry format, providing users with an understanding of how to mix and apply the product effectively for pest control.