Which of the following is NOT a kind of pesticide formulation mentioned?

Foams are indeed commonly used forms of pesticides, particularly for applications that require adherence to vertical or irregular surfaces, such as in cracks and crevices or on certain plants. Pesticides can be formulated in various ways to enhance their effectiveness, safety, and ease of application.

Granules are solid, often pellet-like formulations that allow for slow release and targeted application, especially in outdoor settings. Wettable powders are another well-known formulation, which consist of powdered pesticide that must be mixed with water before use and can be applied as a spray. Pressurized cans, or aerosol formulations, provide convenience and ease of use for spot treatments and are also a recognized method of delivering pesticides.

In contrast, while foams do exist as a pesticide delivery system, the question specifically asks for a formulation not typically categorized under standard types of formulations used in the industry. Therefore, identifying foams as not fitting the primary categories of granules, wettable powders, and pressurized cans allows for a clearer understanding of the classification of pesticide formulations.