IPM is an eco-friendly strategy that focuses on long term prevention of pests or their damage through a combination of techniques such as biological control, habitat manipulation, modification of cultural practices, and use of resistant varieties. IPM also calls for the use of natural pesticides. Naturally occurring compounds from plants, animals, fungi and bacteria can act as pesticides. Another unique technique as a part of IPM is the Sterile Insect Technique (SIT). Here, sterile male pests are introduced into the pest population to trick females into unsuccessful breeding encounters, providing a form of birth control and reducing reproduction rates.