Which pesticide formulation is abbreviated as DU?

The pesticide formulation abbreviated as DU refers to "Dust." Dust formulations are typically dry products designed to be applied in a powdered form, allowing for easy coverage of surfaces or plants to control pests. They are particularly useful for targeting pests that may reside in hard-to-reach areas or for applications in dry conditions, where a liquid formulation might not be as effective.

In contrast, the other options do not align with the abbreviation DU. "Dilute" suggests a liquid mixture where a concentrated pesticide is combined with a solvent like water. "Drip" relates to a method of application typically used in irrigation systems, which is also a liquid form but does not correspond to the abbreviation in question. "Dry," while it might seem like a fitting option, is too broad and does not specifically represent any recognized pesticide formulation abbreviation in the context of the question. Dust is the precise term that matches the abbreviation DU.