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Pest & Disease Library · Solutions

Root-Knot Nematode Control in Tomato

Root-knot nematodes (Meloidogyne spp.) are among the most damaging soil pests in tomato, especially in warm, sandy, repeat-planted ground. They invade feeder roots and form galls that choke water and nutrient uptake, so plants decline as if from drought or nutrient shortage even when soil moisture and fertility are fine.

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 or before transplant and through early root development, before galling advances. Warm soil speeds cycles, so don’t wait for symptoms.

What to look for

  • Patches of stunted plants that wilt in the day and don’t fully recover
  • Yellowing and early leaf drop from the bottom up
  • Visible root galls when plants are lifted
  • Reduced set and small, uneven fruit under load

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 — a geraniol-based encapsulated nematicide that releases in the root zone, with 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

Can I use it on established tomatoes?

Yes — soil-directed applications help mid-season, though treating at planting before galling gives the best result.