Visible insects / animals & Conspicuous growth

Fungus gnats

📍

Affected area Root zone / substrate, Whole plant

📈

Wachstums-Check Very slow growth, Stagnation, Gradually worsened

Erkennungsmerkmale

⚠️ Verwechslungsgefahr

Fungus gnats sit directly on the soil and fly up when watered. Do not confuse them with fruit flies. If the leaves turn yellow, it is due to damaged roots – do not fertilize extra now, but fight the larvae.

Go to solution

Ursachenforschung: Was ist passiert?

Substrate that are too moist (cannabis needs dry periods). The larvae hatch in the top layer of soil and feed on the root hairs.

Systemische Einordnung

What is often really behind it

Water problems are rarely caused by too much or too little water alone. Oxygen supply, substrate structure, watering rhythm, and activity in the root zone are crucial. If the soil environment is permanently too wet, too dense, or microbiologically unstable, not only root growth but also the plant's entire nutrient uptake suffers. In a living soil system, water management is therefore always a matter of soil life, air pores, and biological balance.

These problems often occur together

✓ Grow Lab expert solution

The right treatment

Allow the substrate to dry out to a depth of 2-3 cm.
Use yellow sticky traps to control adult flies.

Water with SF nematodes (Steinernema feltiae) to biologically eliminate larvae in the soil.

Passende Ratgeber aus dem Magazin

Experten-Wissen

Fungus Gnats in Your Grow – Causes, Damage, and Biological Solutions

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