Which pesticide formulation is typically the most concentrated and requires dilution with water before use?

• A. Emulsifiable Concentrate
• B. Wettable Powder
• C. Granular
• D. Suspension Concentrate

Answer: (A)

Concentration and how a pesticide is formulated determines whether it must be diluted. Emulsifiable concentrates are concentrated liquids in an organic solvent with a surfactant, so the active ingredient is present at a high level. Before use, they are diluted with water to form an emulsion, which lowers the concentration to a safe, uniform spray and helps with proper coverage. This makes emulsifiable concentrates the most concentrated common formulation and the one that requires water dilution. In contrast, granules are applied dry, wettable powders are solids that are dispersed in water but aren’t as concentrated as EC, and suspension concentrates are suspensions in water that are generally less concentrated than EC.