Which liquid pesticide formulation consists of a small amount of active ingredient (often 1% or less per unit volume)?

• A. Micro-encapsulated. (M)
• B. Ready to use (low concentrate) solution. (RTU)
• C. Ultra low volume. (ULV)
• D. Emulsifiable concentrate. (EC)

Answer: (B)

Understanding how liquid pesticide formulations differ by how much active ingredient they carry in each unit of liquid is key. The phrase “ready-to-use (low concentrate) solution” describes products that come premixed and are used as-is without dilution, with the active ingredient present at a low percentage in the spray solution—often around 1% or less per unit volume. This matches the description in the question because it specifically refers to a liquid that delivers a small amount of active ingredient per volume while being ready to apply.

Micro-encapsulated formulations focus on releasing the active ingredient from tiny capsules, so they’re not defined by a simple low percent in the liquid. Emulsifiable concentrates are high in active ingredient per volume and require dilution, so they don’t fit the description of a low-percentage, ready-to-use liquid. Ultra-low-volume describes the small amount of liquid applied per area, not the concentration of active ingredient in the liquid itself, so it’s about application rate rather than the per-volume content. Therefore, the ready-to-use low-concentration solution is the correct choice.