Which method is commonly used to apply larvicides?

The method of applying larvicides through aerial or ground equipment is widely utilized because it allows for the effective treatment of large areas in a timely manner. Aerial applications can cover extensive regions quickly, which is particularly beneficial in managing mosquito populations or other pests in hard-to-reach locations like wetlands or large bodies of water. Ground equipment, such as truck-mounted sprayers, offers the flexibility to adjust application rates and focus on specific areas while still being efficient.

The other options suggest limitations in the application methods. Using only hand sprayers or relying solely on hydraulic field sprayers would restrict the capacity and efficiency needed for larvicide application, especially in larger infestations where a broader coverage is essential. Thus, the combination of both aerial and ground equipment provides a comprehensive approach to larviciding that maximizes effectiveness and safety.