Which type of pesticide application would be most effective for controlling cockroaches inside buildings?

The most effective method for controlling cockroaches inside buildings is the crack and crevice application. This technique targets the specific hiding places where cockroaches typically reside, such as in the gaps between walls, under sinks, and behind appliances. By applying pesticide directly into these cracks and crevices, it enhances the likelihood that cockroaches will come into contact with the insecticide, thereby increasing the effectiveness of the treatment.

In contrast, broadcast application would cover a larger area and may not effectively reach the secluded locations where cockroaches hide. Foliar spray is most suitable for treating pests on plants and is not practical for indoor pest control. Aerial application is typically used for large outdoor areas and would not be appropriate for treating pests inside buildings. Therefore, the crack and crevice application method maximizes efficiency and effectiveness for cockroach control in indoor environments.