Orange and blue would be nice. Once we were traveling the ICW in Louisiana in our sailboat in September and there were thousands of them and we couldn't swat them because of the mess. My husband finally got out the shop vac and and sucked them up from the underside of the bimini. Very effective.
However, since they don't bite I'd take them over the big green flies in Georgia in May. They do bite. We killed over a thousand of them one morning. It was fun to keep count.
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