I tried praying a couple years ago, didn't work out so good for the 55 deer that died. The midges 7 day cycle doesn't hold true it you have new midges hatching, the wild deer all the way around me died from mid august until the last week in October, new midges keep hatching as long as the weather permits. If you've ever had EHD before, the virus has never left and won't until you break the midges life cycle. Midges don't travel far from the mud that they are hatched on. It might only be 5 midges out of a 1,000 midges that are carrying the virus, if you fogged around your pens in the evening, you have a dam good chance of hitting those 5 midges that are infecting your deer. don't worry about the midges 2 miles away, concentrate on the ones within a few hundred yards of your pens. If its a river big enough to float a boat on, I'd throw the fogger in the boat and you could fog 2 miles of frontage in a matter of minutes or if you can get anywhere close with an atv, the fog will drift for several hundred yards in the cool evening air and kill every one of them. EHD is around us every year, it's usually worse on dry years because a lot of deer are watering at the same stagnant water sources and the infected EHD midges are swarming around it waiting for a meal to come in and get a drink. I fogged all my stock dams a couple times a week and have completely stopped it on my wild deer. I used to loose hundreds some years. I know it's not just because of the year because others find dead ones all around me every year. Good luck and get lotsa Dex and Draxxin, that will save some of the ones who get it.