The top nuisance pest in America is the mosquito. Mosquitoes are not only annoying but can also transmit deadly diseases such as malaria, dengue fever, and Zika virus. They thrive in warm and humid climates and can breed in even the smallest amount of standing water. Preventative measures like using mosquito repellent, wearing long-sleeved clothing, and removing standing water from around a property can help reduce the mosquito population.