They sound like nasty little Boogers!
What to do
A trapping method homeowners can use, which does not involve the use of pesticides, is called the “sticky black ball” trap. Basically it is a beach ball, (milk jugs work just as well and are easier to hang) painted black and coated with a sticky substance. The sticky substance is called Tangle-Trap and comes in a spray or liquid applicator. It can be found at local Ace Hardware stores.
These devices are hung from a tree limb using string, in a shaded area, about 4 feet above the ground. Movement of the ball by the wind attracts the flies, thinking it is an animal, they land, get stuck, and die on the ball. Several of these balls will reduce the local adult populations.
Birds are not attracted to the ball nor can be “stuck” as the adhesive is only strong enough for insects.
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