Hot weather accompanied by rainfall can create a virtual mosquito paradise. Aside from the itchy bites, the insects can also leave the West Nile Virus with their victims. Iowa Department of Public Health Veterinarian Anne Garvey says that's why it's important to use insect repellent.Garvey says another way to avoid mosquitoes is to stay indoors during dusk and dawn. She says that's when they're most active. She also says mosquitoes lay their eggs in water, which is why it's important to change water in things like bird baths, pet dishes and wading pools every three days.