Cluster Flies – The Mad Rush

You’re not the only one eagerly anticipating the mad rush to enjoy the great outdoors. Their annoying buzzing as well as large numbers at times has become an indicator that spring is near. We’re referring to Cluster Flies.

Cluster Flies are nature’s way of letting us know that spring is near. Those first warm days will bring them out of hibernation and as they emerge they are in essence asking “can I go out now?” You will find them making their way to your windows or doors. At this time they are not as alert since they are just starting to wake up but rather sluggish and can be easily caught or vacuumed. If they appear in large numbers it may require that your cracks and crevices be treated. By the way you will also notice the Asian lady beetle (most call them lady bugs) emerging, this is also an indicator that you have cluster flies. They too want to enjoy the great outdoors. Since they are considered a beneficial insect there is no treatment prescribed for them other than removing their food source – other insects.

Normally they are quite happy to be in the great outdoors until the weather begins to get cold. Then, like us they pursue a warmer place to overwinter. This migration begins in the latter part of August, early part of September. They usually work their way into our attics, wall voids, behind baseboards, draperies, or under our carpets.

The most effective control for these pests is to treat the perimeter of the structure (especially the sunny side) prior to their migration indoors in late summer early fall. The timing of course is crucial if control is to be achieved. This would also include pest proofing your home by sealing cracks and crevices along those areas they use to gain entry into your home (eaves, windows, doors as well as where the siding meets your foundation). However, the reality is that once you have them it becomes an annual occurrence that will be only lessen with regular treatments.

If you have a Cluster Fly problem, schedule a pest inspection today!