MILWAUKEE (AP) — Mosquito season is already off to an annoying start in northern Wisconsin. The problem has been so bad that one canoeing company turned away customers rather than send them on a bug-infested river. But the overall summer outlook might not be so bad. PJ Liesch is an entomologist at the University of Wisconsin-Madison. He says an abrupt change in weather conditions caused mosquitoes to hatch all at once instead of gradually. He says that might make the season seem worse than usual, but early indications suggest it'll be average. Ed Hammer runs Wisconsin River Outfitters in Lake Tomahawk. He's turned away half a dozen customers, saying he doesn't want bugs to ruin their adventures. He says swarms have been so massive that their buzzing is easily audible.