They're awful where I live (and the season lasts all summer long), but not so aggressive - they don't even bite when I'm running, only if I stop. You must have extra hungry flies!
Bite Blocker seems to do a pretty good job when I'm in the garden. I'm sure you'd need to re-apply periodically (they claim 4-8 hours, but it's tested effective only for about 90 minutes, and that's pretty much my experience with it). It comes in a pretty small bottle that would fit in a bento box or jersey pocket. Or you could make your own wipes by soaking shop-rag grade paper towels and putting them in a ziploc bag.

Originally Posted by
Bike Writer
they like blue.
Oh wonderful. Says she of the blue bike with blue tires, blue handlebar tape, blue water bottle cages and blue helmet.
Thank goodness I only wear hi-viz yellow jerseys and black shorts ...
Speed comes from what you put behind you. - Judi Ketteler