Does anyone know of a good spray to use on the ground. We have alot of flies in the morning hanging around the sun side of the barn. Not bad on the other end. They dissapate aroudn 10 oclock.

But it is like a plague until then. The California heat wave must have hatched a second batch.

I have heard that Magnolia extract is a repellant? It has to be something to stick, but not ruin the boards or anything that it might get on.