Use dust for treating carpenter bees.

• A. Dust
• B. Liquid spray
• C. Foam
• D. Gel

Answer: (A)

Dust formulations are ideal for carpenter bees because they can be puffed directly into the wood galleries where these bees nest, and the fine particles cling to the interior walls. This delivers contact exposure right where the bees spend their time, and the dust stays longer in the tunnels than liquids or foams, continuing to affect bees as they move through the channels. Liquids can wash away or fail to penetrate deep enough into narrow tunnels, foams may not reach or persist in long interior passages, and gels are better suited for exterior cracks rather than interior wood galleries. So dust targets the problem most effectively by reaching and lingering in the bees’ nesting tunnels.