I have been using Bushman 40% DEET the last two nights and no bites. I used RID a few days ago and was bitten on the hand 4 times in as many minutes even though covered with repellant. I hate this time of year for observing. It seems to be worse after a heavy rain storm and dies down again after a few dry days. From my experience (and numerous bites) Aeroguard seems to be more effective than RID
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