Strainer screens are not needed to catch product particles when applying which of the following formulations?

Strainer screens are typically used in application equipment to filter out solid particles from liquid formulations, ensuring that the application process operates smoothly without any blockages. The correct answer is the emulsifiable concentrate (EC) formulation, as this type of product is a liquid where the active ingredient is dissolved in oil and emulsified with surfactants.

Since EC formulations are homogeneously mixed and do not contain solid particles, there is no need for strainer screens to catch product particles during application. This characteristic allows for efficient and effective application without the risk of clogging.

In contrast, other formulations like wettable powders (WP), dry flowables (DF), and water-dispersible granules (WDG) can contain solid particles that need to be filtered out to prevent interruptions in the spray equipment. Therefore, strainer screens are necessary for those types to catch any undissolved components, which could lead to operational issues if not filtered out.