Reducing humidity of stored grains to prevent mold is an example of which pest management method?

Reducing humidity of stored grains to prevent mold exemplifies physical/environmental modifications in pest management. This method focuses on altering the environment to make it less conducive to pests' survival and reproduction. By lowering the humidity, the conditions become unfavorable for mold growth, which is crucial as molds can adversely affect the quality of stored grains and pose health risks.

In this context, humidity control directly impacts the environmental factors that influence pest populations, thereby preventing the establishment and spread of mold. This proactive approach is effective because it addresses the root cause of the problem—high humidity—rather than reacting to the symptoms, such as attempting to deal with the mold after it has appeared.

While the other methods mentioned serve important roles in integrated pest management, they do not specifically address the environmental aspect of moisture control associated with mold prevention.