Now you can find various repellents to apply to the skin or other upper parts that repel insects and other pests from climbing on that surface. In fact, these repellents are available based on the production of sound, especially ultrasound. It is true that these repellents help prevent the onset of insect-borne diseases such as dengue fever, malaria, West Nile fever and bubonic plague. According to many studies and research, synthetic insect repellents tend to be more effective and long-lasting than natural ones. While there are DEET products that can be very effective, synthetic repellents can also provide adequate relief. Check the Internet for more information on mosquito spray