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Controlling Black Flies

Source: NDSU Extension Service Entomologist

Call them black flies or buffalo gnats, either way they're blood-thirsty pests when you're working or playing outside. This insect tends to be more of a problem near rivers and streams since the larvae develop in fast flowing water. During certain years black fly infestations make outdoor life miserable for man and animals in the spring and early summer.

Black flies bite people on the back of the neck, behind the ears and they also will crawl under shirt sleeves and trouser legs in order to obtain a blood meal. At first their bites are not detectable but generally within an hour or so, swelling and intense itching begins.

Mosquito repellents such as Cutters, Off or 6-12 will give temporary protection against these pests. Special attention should be given to treating the back of the neck, ears, and other exposed areas where black flies tend to persist. Repeat applications should be made every 3-4 hours with continued outdoor activity. Special repellents for use on pets are available from veterinarians.

If you have further questions, please contact your county office of the NDSU Extension Service.

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