Cold-Season Fungus Gnat Control
Dec 26, 2025
Winter’s steady moisture creates the perfect conditions for fungus gnats and other soil pests to build up. The most effective strategy is early biological prevention—before populations establish. Start with a soil drench of Entonem beneficial nematodes to target larvae below the surface. Reinforce with Entomite-M predatory mites in potting media to patrol for gnat larvae and thrips pupae. Use Horiver Yellow traps or Horiver Discs to monitor adult activity and reduce reproduction. If a reset is needed before introducing beneficials, selective options like Isarid™ or Dune™ can help—just allow residues to dry before releases. Acting now keeps your crop clean and your IPM program strong.
Fungus gnat larvae thrive in moist substrates, feeding on roots and organic matter long before adults appear. By the time you see flying gnats, damage is already underway. Applying biologicals when pest pressure is low, gives them time to establish and patrol the root zone. Combining drenches with media predators creates a layered defense that stops larvae before they mature. Acting now not only prevents stress but also reduces the need for corrective sprays later—keeping your IPM program clean and sustainable.
Find solutions in How to Stop Fungus Gnats Before They Start and dive into the science behind sciarid flies in How to Solve Fungus Gnats
