Which of the following is NOT a common formulation of pesticides?

The correct choice indicates that gas formulations are not commonly recognized as a standard pesticide formulation. Pesticides are typically formulated in a way that allows for effective application and targeted action against pests.

Powdered concentrates, liquid concentrates, and granular formulations are all formulations frequently used in pesticide applications. Each type has its specific use cases: powdered concentrates can be mixed with water for sprays, liquid concentrates are often easy to apply as they are already in a mixed state for application, and granular formulations are utilized for applications in soil or as bait, providing a slow-release effect for pest control.

Gas formulations, while they do exist in certain specialized applications—such as in fumigation—are not commonly associated with general pesticide uses. They may present practical challenges in handling and application compared to more traditional formulations used widely in agriculture and landscaping. Therefore, the correct answer highlights the rarity and specialized nature of gas formulations in the context of typical pesticide applications.