It’s DIY pest control. Key to preventing infestations of the disease-carrying mosquitoes, ticks and mice in yards and homes: creating an inhospitable environment by draining water that accumulates in surprising places, cleaning up plant life and debris, and keeping bird feeders, compost bins and other pest-food sources away from the house. As residents embark on cleaning and landscaping and open up summer cabins, the Spokane Regional Health District is offering those and other tips for curbing pests. In particular, deer mice, mosquitoes and ticks can carry hantavirus, West Nile virus and Rocky Mountain spotted fever, among other illnesses.