Nematodes are tiny, worm-like pests found in the soil that feed on plant roots. In wheat, nematodes cause severe damage by reducing root growth, weakening the plant, and lowering grain yield. In many parts of India, farmers face problems like poor germination, yellowing patches in fields, stunted plants, and low tillering—all of which can be signs of nematode attack. Managing nematodes early is important because once they multiply in the soil, they can stay for many years. With proper field practices, their population can be reduced and wheat productivity can be protected.
1. Identify symptoms early
The first step is understanding the signs of nematode infestation.
Common symptoms include:
Stunted growth and uneven crop patches
Poor tillering
Yellowing or pale leaves
Thin and weak roots
Plants that wilt even when moisture is available
These symptoms often appear in circular or irregular patches across the field.
2. Practice crop rotation
Crop rotation is one of the most effective and low-cost methods to control nematodes in wheat. Rotating wheat with non-host crops such as mustard, maize, sorghum, bajra, chickpea, or mungbean reduces nematode populations naturally. Avoid growing wheat or other cereal crops continuously in the same field, as this increases nematode buildup.
3. Use resistant and tolerant varieties
Some wheat varieties show better tolerance to nematodes. Farmers should select improved varieties recommended for their region, especially in nematode-affected areas. These varieties may not eliminate nematodes but can reduce the damage and maintain yield.
4. Soil solarization before sowing
In areas with high sunlight, soil solarization is a helpful technique.
Steps:
Moisten the soil lightly.
Cover it with transparent polythene sheets for 3–4 weeks during peak summer.
The heat trapped under the sheet kills nematodes and other soil pests, reducing their numbers before sowing wheat.
5. Use organic amendments
Adding organic matter improves soil health and helps suppress nematodes.
Useful organic materials include:
Farmyard manure (FYM)
Neem cake
Mustard cake
Vermicompost
Neem cake is especially effective because it contains natural compounds that reduce nematode activity. Adding 1–2 quintals per acre during land preparation can give good results.
6. Seed treatment for protection
Treating seeds before sowing helps protect young seedlings from early infection. Use recommended fungicide and bio-nematicide treatments. Bio-products containing Paecilomyces, Trichoderma, or Pochonia chlamydosporia help naturally reduce nematode populations when applied to soil or seed.
7. Maintain good field sanitation
Remove crop residues from heavily infected fields.
Avoid using contaminated soil or implements from one field to another.
Do not allow weeds to grow, as some weeds also host nematodes.
A clean field helps reduce pest survival.
8. Balanced fertilizer management
Healthy plants resist nematode damage better. Apply nitrogen, phosphorus, and potassium as per recommendation. Using organic manure along with chemical fertilizers strengthens root growth, helping plants tolerate nematode attack.
9. Chemical control (if necessary)
In severely affected fields, recommended nematicides may be used during soil preparation. However, these should be applied carefully and only when essential.
