But some can be as seemingly insignificant as a toy left out for several days, a clogged rain gutter or Magnolia leaves. When upturned, the gargantuan leaves from one of the South's favorite trees is an Olympic-size pool for hundreds of mosquito larvae. All of these items and more are part of the mosquitoes' backyard sanctuaries. If you're having mosquitoes all day, they are probably tigers, container grown and very aggressive. You are raising them yourself or there's some problem nearby.
Most mosquitoes only come out in the evening hours, after the heat of the day.
The tiny insects are not just pests that make you itch and can ruin an afternoon cookout. They can also bring deadly diseases to your doorstep. Ponds, swamps and stagnant streams are the more traditional mosquito haunts and still can deliver the biggest punch. The black swamp mosquito, the carrier of deadly eastern equine encephalitis that has shown up in some cases here recently, hangs out there. There is a whole litany of other dangerous mosquito-borne diseases for which we can thank the tiny insects, in this country and worldwide.