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...nothing beats DEET as a mosquito repellent, and as far as all the research has been able to tell, DEET is harmless to humans, even to the point of showering in it. Somewhere around 18%-20% DEET spray should give you max protection, with any higher DEET content not adding any more effectiveness.
The underlined is not my experience.
I find the 25% stuff works pretty well where bugs are a minor nuisance, but fails miserably on courses where they get really hairy (lots of stangant water or really out in BFE where things are thick and bugs are crazy). The 40% stuff seems to work well in those situations, so that's what I carry in my bag.
Maybe the DEET spray evaporates gradually, losing its effectiveness over time, but the 40% stays above the max. effectiveness threshold for longer. Or maybe the studies I was told about ~10 years ago when I worked at REI have been corrected by more recent research. Whatever the ideal %, DEET is definitely the most effective product on the market.
Bug spray is pricey these days. I'm the only one in the group that ever seems to have some. That and water.
I play with an old timer who tucks a sheet in the adjustment strap of his hat. It seems to work well for him, although he looks a little weird with it hanging out the back.I've heard mosquitoes don't like the smell of dryer sheets, so some people play with a dryer sheet in their pocket.
http://www.doterra.com/au/productpages/TerraShield_PIP_v11.pdf
Just a couple of drops on the arms and legs (if wearing shorts). We have some major mosquito issues here in Tennessee, and I've yet to get bitten after applying this stuff. A bottle usually contains about 100 drops or so, so it's good for about 25 rounds. One drop on each leg and arm does the trick for me.
Personally, Deep Woods Off does not work for me. I use Repel brand 100% Deet all the time. The only problem with it is that it's pretty oily. We did a 4 day camping trip to the west side of MI last year, played sun up to sun down every day, and never once got bitten by anything.