In some buildings, fans are installed above doors to prevent the entry of flying insects. An area of pest-control research that has received much attention in recent years involves baiting traps with the pest's own sex attractants, or pheromones. Pheromone traps have been used extensively against the fruit fly and gypsy moth. Pheromones are also being used to attract and trap pests that infest stored foods and grains. Many countries use importation and quarantine regulations to control the importation of foreign plant or insect pests.
Fruit is especially prone to insect infestation and disease.
In the United States, the Animal and Plant Health Inspection Service monitors incoming products and materials and requires certain products to be treated prior to entry. Similar controls exist in other countries. Some regions have quarantine regulations to ensure that certain insect pests are not brought into the area. In the United States, individual states have their own inspection services. Some states even have border inspection stations to prevent unauthorized transport of plants across state lines.