Irecently repotted my houseplants and have been battling a tiny fly infestation ever since. I’ve tried exterminator services, soapy water, dryer sheets — you name it — the flies are still thriving. Do you have any guidance for me?

— Cindy Golan, Park Ridge

Gardening is supposed to be a relaxing hobby, but like you, I sometimes find working with plants rather frustrating. Your description sounds like you have an ongoing healthy infestation of fungus gnats. They are a common pest of plants grown indoors and are often associated with overwatered houseplants. They can become a nuisance when they are present in large numbers and fly around inside a home. The adult fungus gnat is a small (⅛-inch-long), dark, mosquito-like insect with long legs and one pair of clear wings. It’s harmless (it doe

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