What is a common characteristic of wettable powders (WP)?

Wettable powders (WP) are a type of pesticide formulation that are designed to be mixed with water for application. One of their defining characteristics is that they do not dissolve completely in water but instead remain suspended in the liquid, which is why they require frequent agitation. Agitation is necessary to ensure the powder is evenly distributed throughout the mixture, allowing for consistent application.

While it is true that wettable powders do provide effective pest control, they can settle at the bottom of the container if left undisturbed, making agitation important to maintain their effectiveness. This characteristic is crucial for those applying them, as it helps prevent uneven coverage and maximizes pest control efficacy.

In contrast, the other options do not accurately reflect the properties of wettable powders. They do not completely dissolve, they may not be safe for all surfaces without prior testing, and they can leave visible residues if not mixed correctly, particularly after they dry.