Which of the following best describes a blower type granular spreader?

A blower type granular spreader is designed specifically to distribute granules using the force generated by a fan. This mechanism allows for an even and wide distribution of granular materials, such as fertilizers or herbicides, over a large area. The blowing action helps to carry the granules forward, ensuring they are spread efficiently across the target surface, whether it be a lawn, garden, or other areas needing treatment.

The use of a fan not only enhances coverage but also helps to control the spread pattern, making it suitable for varying applications where precise distribution is needed. This functionality is crucial for effective pest control and plant nutrition.

In contrast, other devices mentioned in the question serve different purposes. Hand-held devices would focus more on precision and localized applications rather than broad distribution. Machines that spread only liquid fertilizers or are used for liquid pesticide applications involve different mechanisms and do not fit the description of a blower type granular spreader. Hence, the unique capability of the blower to utilize air for granule distribution establishes it as the correct choice.