Stem rot is one of the major diseases affecting mustard crops in many parts of India. It is commonly caused by a soil-borne fungus that attacks the stem near the ground level. The disease weakens the plant, reduces nutrient flow, and eventually causes wilting and drying. If not managed on time, stem rot can spread quickly and cause heavy yield losses. Understanding how to control this disease helps farmers protect their mustard crop and ensure a healthy harvest.
Stem rot usually appears when the weather is cool and humid, especially during flowering and pod formation stages. The first symptoms include light brown patches on the stem near the soil surface. As the disease progresses, a white cotton-like fungal growth may appear, and the stem becomes soft and cracked. Infected plants may lodge or fall over easily because the base becomes weak.
The most effective way to control stem rot is to focus on preventive measures, because once the fungus enters the plant, it becomes difficult to stop completely. Good crop rotation is one of the simplest practices. Mustard should not be grown repeatedly in the same field, especially after crops like sunflower, groundnut, or other oilseed crops that are also prone to stem rot. Rotating with cereals such as wheat, maize, or rice helps reduce the fungus population in the soil.
Proper land preparation also plays an important role. Deep ploughing during summer helps expose the disease-causing fungus to sunlight, which reduces its survival. Removing crop residues after harvest is equally important, because infected plant parts left in the field can carry the fungus to the next season.
Seed treatment is another essential step. Treating mustard seeds with a recommended fungicide before sowing helps protect seedlings from early infection. Healthy seedlings establish better and show more resistance later in the season.
Balanced fertilizer application strengthens the plant and helps it fight diseases better. Too much nitrogen makes mustard plants soft and more susceptible to stem rot. Instead, farmers should ensure a balanced supply of nitrogen, phosphorus, and potassium. Potassium, in particular, improves stem strength and reduces disease severity.
Field hygiene is also important. Farmers should avoid waterlogging and ensure proper drainage because excess moisture around the stem encourages fungal growth. Sowing at proper spacing allows good air circulation, which helps reduce humidity around plants.
If stem rot appears in the field, farmers should immediately remove infected plants and destroy them away from the field to prevent further spread. Spot application of recommended fungicides around the infected area can help slow down the disease, but this works best only in early stages.
Some mustard varieties show better tolerance to stem rot. Choosing such varieties can reduce the chances of disease, especially in areas where stem rot occurs frequently.
In simple words, controlling stem rot in mustard requires a combination of crop rotation, clean land preparation, seed treatment, proper nutrient management, good drainage, and timely removal of infected plants. By following these practices, farmers can protect their mustard fields and maintain a healthy crop with good yields.
