Donna, if you just opened your house back up and turned the heat up, you likely just woke them up!
From and online article:
"As the winter nears many insects become scarce. Adult house flies, for example, die off. Thank goodness for that I hear you say. Just remember though, that house fly eggs live on and are to be found in their larval or pupal stage hiding in some dung or in some rubbish somewhere. They may also be laid in warm attics or rafters. Flies are opportunistic and will lay their eggs anywhere that is a food source. For instance, if a mouse of bird has died in your attic, flies will use its rotting corpse as the perfect host for its young.
If the pupae or larvea were outside they would stay dormant through the cold weather. The trouble with lofts though, is that warm air tends to rise and keep them relatively warm. The eggs won't stay dormant for long. The warmth in the loft will result in continuous development until the young flies are finally hatched and, as is their nature, start to rove around looking for food."
|