What is the best way to repel black flies when outside?

* Use insect repellent. Look for a repellent that contains DEET, picaridin, or IR3535. Apply the repellent to your skin and clothing, paying special attention to areas that are exposed.

* Wear long sleeves and pants. This will help to create a physical barrier between your skin and the black flies.

* Tuck your pants into your socks. This will help to prevent the black flies from crawling up your legs.

* Wear a hat. This will help to protect your head and face from the black flies.

* Avoid areas where black flies are known to be present. If you must be in an area where black flies are present, try to stay indoors as much as possible.

* Use a fly swatter or fly trap. If you see a black fly, try to swat it with a fly swatter or trap it in a fly trap.