Which formulation is designed to release the active ingredient slowly over time?

• A. Emulsifiable concentrates
• B. Granules
• C. Microencapsulated formulations
• D. Wettable powders

Answer: (C)

Microencapsulation creates tiny capsules that hold the active ingredient and release it slowly over time. The capsule wall acts as a barrier, so the pesticide diffuses out or the capsule gradually breaks down, delivering protection for a longer period after each application. This approach smooths out the pest-control effect, reduces the need for frequent reapplications, and can help limit environmental peaks.

Other formulations are generally designed for quicker action. Emulsifiable concentrates mix with water to form a spray that disperses rapidly and delivers the active quickly. Wettable powders and some granules disperse or dissolve upon application or in the environment, leading to faster release rather than a controlled, slow release.