Illinois Pesticide Applicator Practice Test

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When mixed with water, what is necessary for wettable powders?

  1. No stirring needed

  2. Frequent spraying

  3. Gentle mixing only

  4. Agitation

The correct answer is: Agitation

Wettable powders are formulated to be mixed with water for application, often in pest control. When these powders are combined with water, they do not completely dissolve; instead, they create a suspension. For the suspension to be effective and ensure an even distribution of the active ingredients, agitation is necessary. Agitation helps prevent the wettable powder from settling at the bottom of the tank, which ensures that the application remains consistent throughout the spraying process. Frequent agitation is essential because, without it, the particles can clump together and may not be uniformly distributed, leading to ineffective treatments or potential damage to plants and surrounding environments. This is especially crucial in scenarios where the mixture will remain in the spray tank for an extended period.

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