They sure are annoying. An entomologist at the University of Wisconsin-Madison says the nuisance factor from millions of mosquitoes is a bigger consideration than worries about diseases like West Nile. After days of rain and flooding, standing water is providing a breeding ground for mosquitoes. Susan Paskewitz says this is going to be an unusual year for the pests because their activity is normally slowing down in September. Many people are looking forward to the first cold snap.