Mustard is a major oilseed crop in India, especially in Rajasthan, Haryana, Uttar Pradesh, and Madhya Pradesh. One of the most damaging diseases affecting mustard is stem rot. Farmers often notice patches of plants suddenly wilting and drying, even though the soil has enough moisture. Stem rot spreads fast during cool and humid weather, and if not managed on time, it can cause heavy yield losses. The good news is that stem rot can be controlled effectively with early action and proper field practices. Here is an easy-to-understand guide for farmers.
1. Identify the Symptoms Early
Early detection is the first step in managing the disease. Common symptoms include:
Soft, water-soaked spots on the stem near the soil surface.
White fungus-like growth around the infected stem.
Plants start wilting suddenly and then collapse.
Sometimes, small black structures (sclerotia) may be seen inside the stem.
Regular field visits during early morning or evening help farmers catch these symptoms before the disease spreads widely.
2. Use Disease-Free Seeds
Many diseases start from infected seeds or plant residues. Always buy certified, clean seeds from trusted suppliers. Seed treatment with suitable fungicides or bio-control agents (like Trichoderma) before sowing adds an extra layer of protection to young seedlings.
3. Improve Soil Drainage
Poor drainage is one of the biggest reasons mustard fields develop stem rot. Waterlogged or compact soil gives ideal conditions for the fungus to grow. To prevent this:
Prepare raised beds or ridges for sowing.
Ensure proper channel formation for draining excess rainwater.
Avoid sowing mustard in low-lying patches where water collects.
Good drainage reduces disease pressure significantly.
4. Maintain Proper Spacing
Overcrowded fields retain more humidity, helping the fungus spread quickly from plant to plant. Follow recommended row spacing during sowing. Proper spacing allows air to move freely and keeps the crop dry, which reduces infection chances.
5. Follow Crop Rotation
Avoid growing mustard or other brassica crops (like cauliflower, cabbage, radish) in the same field year after year. Continuous mustard cropping increases fungal population in the soil. Rotating with cereals like wheat, barley, and millets helps break the disease cycle.
6. Remove and Destroy Infected Plants
If any mustard plant shows clear signs of stem rot, remove it immediately along with its roots. Do not throw infected plants in the field bunds; instead burn or bury them away from the crop. This prevents the fungus from producing sclerotia that can remain in the soil for years.
7. Apply Organic and Chemical Controls
For farmers practicing organic methods:
Apply Trichoderma-based bio-control agents in the soil before sowing.
Mix well-decomposed farmyard manure enriched with Trichoderma.
For farmers using chemical control:
Spray recommended fungicides in the early stage of infection.
Soil drenching around infected patches can stop further spread.
Timely application is the key—spraying after severe spread gives limited results.
8. Avoid Excess Irrigation
Light irrigation is enough for mustard. Over-irrigation increases humidity around the stem and encourages fungal growth. Water only when the soil starts drying, and irrigate during daytime so the field dries quickly.
9. Keep the Field Clean
Remove weeds, old plant residues, and nearby infected grasses. A clean field reduces fungal build-up and protects the crop throughout the season.
