What is a major disadvantage of using dusts (D) in pest control?

The major disadvantage of using dusts in pest control is that they are ineffective when damp. Dust formulations rely on their dry nature to adhere to surfaces and remain effective against pests. When dust becomes damp, it often loses its ability to stick to surfaces and may clump together, reducing its efficacy.

This characteristic makes dusts particularly challenging to use in environments where moisture is present or where there is a risk of rain, as the effectiveness of the applied material diminishes significantly. This limitation can be critical for pest control efforts, as timing and conditions can influence the success of an application.

Other factors like short residual life, compatibility with application equipment, and cost can also play roles in pest control decisions, but the effectiveness of dusts upon exposure to moisture is a primary concern that can directly impact the outcomes of pest management strategies. Understanding this helps professionals make informed choices about when and how to apply dust formulations based on environmental conditions.