Yellow flies and no-see-ums are pesky insects commonly found in the southern region of the United States. The yellow fly is a fierce, biting fly that features a small, yellow body. No-see-ums — also called biting midges and punkies — are tiny biting flies that are barely visible to the human eye. Both types of flies gravitate toward warm, humid and moist areas. The bites from yellow flies and no-see-ums are painful and may cause itching, swelling and possible allergic reactions. Use several strategies to repel these annoying insects and avoid being bitten.
Apply a bug repellent containing diethyl toluamide (deet) to all exposed areas of your body to repel yellow flies and no-see-ums. According to the University of Florida's Department of Entomology and Nematology, deet is the most effective repellent against yellow flies.
Wear physical barriers such as a tightly-meshed head net, long sleeves, pants and gloves where yellow flies and no-see-ums occur in large numbers.
Treat your yard or other outdoor area with an insecticide to temporarily reduce yellow flies and no-see-ums. Products containing permethrin have been proven effective for both types of flies. Purchase these insecticides from farm and garden stores as a surface spray to use on trees and shrubs or as an outdoor aerosol spray for your entire yard.
Replace the standard screens of your home windows with tightly-meshed screens to reduce the incidence of no-see-ums in your home. No-see-ums can easily pass through a standard window screen.