What does the "25" stand for on a pesticide label with the brand name Bugoff 25W?

• A. 25% active ingredient
• B. 25% effective
• C. 25% inert ingredients
• D. 25% water soluble

Answer: (A)

The number on a pesticide product name is the percent of active ingredient by weight in the formulation. So, Bugoff 25W means 25% of the product is the active ingredient and the remaining 75% are inert ingredients or carriers. The “W” part indicates the formulation type (wettable powder or water-dispersible), not the percentage. This helps you calculate how much product to use to get a desired amount of active ingredient per area. For example, if you need 0.5 lb of active per acre, you’d mix 2 lb of Bugoff 25W per acre because 0.25 lb active per pound of product × 2 lb product = 0.5 lb active. The other options don’t reflect how label percentages are used: the number isn’t a measure of effectiveness, inert content, or water solubility.