...and while the pepper spray is for the bears, we need to carry and fire off shotguns to clear a path through the thick, thick clouds of mosquitoes and black flies to even be able to paddle down the river!
:AR15firin
I find it to be not so bad. Mozzies may be a little thicker in June as compared to July/August (or winter, of course), but I hardly put any Deet on, unless it is really bad. Long clothing and a hat help to keep sensitive parts (such as my bald head...) covered. I always carry the head net, just in case, but I have rarely used it.
The worst time for black flies and mosquitoes was last year in May, when we went morel picking in an old burn with some water bodies(=perfect breeding ground). This was the only time in my life that I wore a bug shirt.
I think the mosquito issue in the Yukon is very overrated and I believe it is more of an attitude issue for a lot of folks. I think many guests totally focus on the bugs around them and so it becomes a huge problem. You can wear long clothes and put repellent on, but you can't really change it. The bugs are part of it. So don't sweat it! When I get stung, I found it stops itching after about 15-20 min (if I do my part = not scratching!). The bugs are a lot less itchy than their counterparts I experienced in Europe (at least for me).
While canoeing there is usually enough breeze to keep them away. Bugs would only be an issue (...if you choose to make it one...) while camping in the woods.
@Joe tahkahikew: I have never been to NWT, so can't judge it, but I heard wild mozzy and black fly stories from over there. If folks in the Yukon want to make sure everybody understands how bad the bugs were on a particular day or spot, they refer to it as "NWT-bad"...
All the best from a snowy (and currently bug free) Yukon!