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Pest & Disease Library · Solutions

Root-Knot Nematode Control in Cannabis and Hemp

Root-knot nematodes attack cannabis and hemp roots in field and media-grown crops, undermining the vigorous root system a high-value flowering crop needs. Damage shows as unexplained stress and uneven growth that fertility corrections don’t fix.

Common crops affected

Why it matters

Galled roots can't feed the plant — stunting, wilting, and yield loss follow, and the wounds invite secondary soil pathogens. Nematodes are hard to eradicate once established, so early, targeted control protects the crop and the soil.

When to act

Treat at transplant and early root development; re-treat between cycles in continuous media systems.

What to look for

  • Uneven, stunted plants across a block
  • Midday wilt with overnight recovery
  • Galled roots at inspection
  • Reduced vigour and flower development

How to manage it

  1. Rotate with non-host or resistant crops in known hot spots.
  2. Build organic matter and soil biology.
  3. Use clean transplants; sanitise tools and avoid moving infested soil.
  4. Apply Nematode Control via soil irrigation, before or at planting and where infestation exists.

Recommended Vegalab program

Nematode Control — root-zone-active, residue-conscious, zero PHI and zero REI.

RoleProductUse
Primary controlNematode ControlSoil-applied natural nematicide (irrigation)
Root recoveryRoot BoostRebuild damaged roots
Soil biologyCharge BioboostSuppressive soil biology

Product claims, rates, and availability vary by jurisdiction; always follow the applicable label.

Frequently asked questions

Does it fit a clean, residue-free program?

Yes — encapsulated release targets the root zone; follow the label for market residue requirements.