Seedling trays are vulnerable to fungus gnats because damp growing media favors larvae and young roots are delicate. Moisture management and early monitoring are the first defenses.
Keep moisture appropriate
Use clean containers and fresh seed-starting mix. Keep the mix moist enough for germination but avoid standing water and prolonged saturation once seedlings are established.
Watch for flying adults
Small sticky monitoring cards placed safely near trays may catch adult gnats. Do not put adhesive against tender leaves or where pets and young children can touch it.
Protect young roots
Larvae in heavy populations can stress seedlings. Improve drainage and airflow, remove decaying plant debris, and use only plant-appropriate pest controls according to label directions when necessary.
Frequently asked questions
Should seed trays be completely dry?
No. Many seeds need consistent moisture to germinate. Balance watering with airflow rather than drying trays indiscriminately.
Related: how to get rid of gnats in kitchen.
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