Which application method involves spreading a pesticide over a large area affecting all plants?

The application method that involves spreading a pesticide over a large area, thereby affecting all plants within that area, is broadcast application. This technique is designed for large-scale treatment, where the pesticide is evenly distributed across a designated area to ensure comprehensive coverage. It is particularly effective for controlling widespread pest infestations, managing weeds, or treating large lawns and fields, where the goal is to impact all vegetation within a specific range.

In contrast to broadcast application, point application targets specific spots or individual plants, making it less effective for managing widespread issues. Spot treatment also applies to specific areas but usually on a much smaller scale than broadcast, and targeted application focuses on particular pest populations or plant types rather than a broad area. Thus, broadcast application is the correct choice for situations where a wide coverage approach is necessary.