Give an example of a physical control method.

The choice that identifies a physical control method correctly highlights the use of traps or barriers to exclude pests from plants. Physical control methods involve the direct application of physical measures to prevent pest access to crops or to eliminate pests that are already present. For instance, physical barriers such as row covers, nets, or screens can effectively prevent pests from reaching the plants, while traps can attract pests and capture them, reducing their populations.

These methods are essential in integrated pest management as they can provide immediate solutions without the use of chemicals, often contributing to a more sustainable approach to pest control. The other options refer to chemical or biological control methods, which focus on using pesticides or living organisms, rather than employing a direct physical intervention.