Common crops affected
What is it?
Root-knot nematodes (Meloidogyne species) are tiny worms that invade roots and trigger the characteristic swellings, or knots (galls), that give them their name. Inside these galls they feed and reproduce, disrupting the plant's ability to take up water and nutrients. They thrive in warm, sandy soils and can build up quickly in continuous plantings of susceptible crops.
How to identify it
- Above ground: stunted growth, yellowing, wilting in the heat of the day despite adequate water, and poor yields
- Below ground (the key sign): swollen galls or knots along the roots — pull up an affected plant and inspect
- Patchy, irregular areas of poor growth across a bed or field
- Symptoms often worse in warm, sandy soils and where the same crop is grown repeatedly
Damage and how it spreads
By damaging the root system, nematodes reduce water and nutrient uptake, stunt plants, and lower yields — and the wounds they create open the door to soil-borne fungi and bacteria. They spread through infested soil, water, tools, and transplants. Because they are hard to eradicate once established, prevention and early control are essential.
How to control it
- Rotate with non-host or resistant crops to break the cycle; avoid replanting susceptible crops in known hot spots.
- Build soil health with organic matter, which supports nematode-suppressive soil biology.
- Sanitize tools and avoid moving infested soil; use clean transplants.
- Apply an effective, targeted nematicide to knock down populations and protect roots, especially before or at planting.
Recommended Vegalab solution: Nematode Control
Vegalab Nematode Control is a next-generation natural nematicide that uses geraniol as its active ingredient and is OMRI-listed. In efficacy trials across crops including tomatoes, cucumbers, melons, strawberries, and watermelons it showed over 90% efficacy (results vary by crop, conditions, and jurisdiction; always follow the applicable label), and it works against a range of parasitic species (root-knot, lesion, burrowing, pin, spiral) by disrupting feeding and reproduction while supporting root growth. Apply via soil irrigation — use the prevention rate to protect clean ground and the higher rate where infestation already exists. Avoid applying right before heavy rain.
| Role | Product | Use |
|---|---|---|
| Primary control | Nematode Control | Soil-applied nematicide (irrigation) |
| Companion / broader pressure | Root Boost | Root development / establishment |
| Plant support | Charge Bioboost | Soil biology / suppressive soil |
Preventing it next season
Plan rotations, keep building organic matter, and treat known hot spots preventively at planting. Vigorous root systems tolerate pressure better — Root Boost and soil inoculants like Charge Bioboost support strong, healthy roots.
Claims and product availability vary by jurisdiction. Always read and follow the product label.