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Tiny bugs on window screens

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May with rain and wind, tiny bugs (gnat or mosquito like) on my 7th floor apartment window screens. What are they, will they die off quickly or should I spray? Worried because they are on all the southern exposure windows - infestation!

Extension Message
From: Richard Hentschel
Extension Educator, Horticulture
DuPage/Kane/Kendall Unit
You are seeing one of many forms of Gnats. They favor this kind of weather and feed on the tiniest bits of debris on surfaces and cracks and crevices that appear clean to the eye. Southern exposures warm up sooner than other exposures and bugs tend to gather on these warmer surfaces. Gnats will disappear once the weather pattern changes to warmer and drier. on their own.

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