The pesticide formulation which requires constant agitation in the spray tank is:

Prepare for the Kansas Structural Pest Control Exam. Utilize flashcards and multiple choice questions with detailed hints and explanations. Set yourself up for success!

The correct choice is wettable powder. This formulation type is a solid pesticide that requires constant agitation in the spray tank to keep the particles suspended in the liquid solution. Wettable powders often contain active ingredients that can settle at the bottom of the tank if not kept in suspension, leading to uneven application and reduced effectiveness.

Maintaining constant agitation ensures that the active ingredient is uniformly distributed in the solution, allowing for efficient application on target pests. This is crucial because improper mixing can mean either insufficient pesticide on the target or a higher concentration that could result in phytotoxicity or environmental harm.

The other options do not typically require the same level of agitation. Oil-based sprays and water-based emulsions generally have properties that allow them to remain mixed without continuous agitation, as their chemical composition stabilizes the formulation in the tank. Therefore, wettable powder is specifically known for the need for constant agitation to ensure effective pest management.

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