From The New Yorker,
"Nothing short of a good breeze keeps Siberian mosquitoes down. They laugh at organic-based repellents. Strong repellent with DEET is disagreeable to them, but they work around it. Thick smoke can be effective, but you have to stand right in it. In past times, native peoples and Russians wove fine netting of the long hairs in a horse’s tail and wore the nets throughout the summer. Members of a tribe called the Tungus carried smoke pots with them wherever they went, while another native people, the Voguls, retreated into smoke-filled huts for the summer months and became dormant, doing most of their hunting and travelling in the wintertime. The sheer volume of mosquitoes might cause an observer not to mention the gnats, flies, and tiny biting insects (known as “no-see-’ums” in America); there are plenty of all those as well."
Since I have read this I bought insect repelling socks, hat, trousers and spray. I've also got a battery powered repellant for the hotel rooms. They aren't having me.