Scientists use different pest control methods that range from choosing a pesticide that will be least harmful to beneficial insects to raising and releasing one insect to attack another. Biological control of horticultural pests is a subject of increasing interest, especially to people who prefer to use chemicals as little as possible. The traditional and familiar use of chemical pesticides sometimes has detrimental effects on the environment (such as with DDT) and harmful effects on humans (such as the increased risk of cancer in individuals exposed to certain pesticides). There are, however, alternative pest control methods, such as biological pest control, that are less harmful to the environment and humans. Unfortunately, biological pest control methods alone are rarely sufficient. Research suggests that an integrated approach, using pesticides, biological pest control, and other techniques may be the most effective.

In general terms, biological pest control...