Reasons for our use of pesticides Some insects are diseases carriers Disease Disease carrier Malaria Anopheles mosquito Bubonic plague Rat fleas Typhus Body lice and fleas Sleeping sickness Tsetse flyReasons for our use of pesticides: Some insects are diseases carriers Disease Disease carrier Malaria Anopheles mosquito Bubonic plague Rat fleas Typhus Body lice and fleas Sleeping sickness Tsetse fly