Fungus Gnats in Ontario
Fungus gnat identification and moisture management for indoor plants and damp organic material.
What fungus gnats look like
Fungus gnats are tiny dark flies with long legs and delicate wings. Adults are often seen walking or flying close to potting soil and windows.
Where activity develops
Larvae develop in moist organic material, especially overwatered potting mix. Persistent moisture is the main condition supporting indoor populations.
Signs worth documenting.
Tiny flies around houseplants
Adults resting on nearby windows
Activity after watering
Make the property less favourable.
Prevention depends on correct identification and the conditions supporting activity. These steps are a practical starting point.
Identification before treatment
Similar-looking pests can require very different responses. Avoid applying a product until the pest, location and permitted label directions are clear.
Serving Eastern Ontario
Emerald Pest Control serves Belleville, Kingston, Trenton, Napanee, Brighton, Stirling, Picton, Quinte West and surrounding communities.
Not sure whether it is fungus gnats?
Send a clear photo and tell us where it was found. We can help confirm the pest and discuss appropriate next steps.