Employ window and door screens , and seal cracks in foundations, doors and walls. For chronic pest problems, consider ultrasonic pest repellers . These devices emit special sounds that humans can't hear but pests can, and these sounds are designed to create an inhospitable audio environment for insects and many small mammals. In other words, first they drive them crazy, then they drive them out. Consumers should make sure that the unit they purchase is designed to emit those specific sounds that have been found to repel the particular pest in question, and then follow all directions carefully with regard to placement and coverage.
Units are available to handle a variety of concerns from mice to spiders.
There are even devices that move the moles to someone else's yard as well as wearable mosquito repellers that emit the sound of approaching dragonflies-that pest's top predator. In addition to sound, herbs and essential oils are another vital weapon in the war on bugs. Fleas are repelled by diatomaceous earth, rosemary oil, and orange oil. Flies will avoid areas scented with basil, tansy, pine oil, or cloves. Or make fly strips of kraft paper coated with a gooey mix of corn syrup and sugar.