What is a common nonchemical control method against cockroaches?

Heat treatment at specific temperatures is a common nonchemical control method against cockroaches because high temperatures can effectively kill these pests. By exposing the environment infested with cockroaches to temperatures exceeding 120°F (about 49°C), the heat can eliminate roaches and their eggs, disrupting their life cycle and reducing their population. This method is particularly effective in locations where chemical pesticide use may be inappropriate or less desirable, such as in food handling areas or living environments.

While cold storage of food items can help prevent the infestation by eliminating food sources for cockroaches, it does not directly eliminate an existing infestation. Insect growth regulators are a type of chemical control, and although they can be effective in managing cockroach populations, they do not fall under nonchemical methods. The application of organic pesticides, while more environmentally friendly than synthetic chemicals, still involves the use of substances that act as pesticides, which means it is also not classified as a nonchemical control method. Therefore, heat treatment stands out as the most effective nonchemical strategy in this scenario.