This method involves preventing insects

1. Exclusion: This method involves preventing insects from entering a building or area. Exclusion methods can include sealing up cracks and crevices, installing screens or mesh over doors and windows, or using netting to cover plants. Exclusion methods can be particularly effective for preventing pests like flies, mosquitoes, and beetles from entering a building, but they may not be practical or effective for all types of pests.
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2. Sterilization: This method involves sterilizing male insects to reduce the population of a particular species. Sterilization can be achieved through irradiation or by treating insects with chemicals that render them sterile. Sterilization is often used in conjunction with other control methods and may be particularly effective for managing pests like fruit flies or mosquitoes.

Insect control is a complex and ever-changing field. The most effective control methods will depend on the specific pest species, the environment, and the situation. It's important to work with a pest control professional or extension agent to identify the best control methods for your particular situation.