Groundnut is one of the most important oilseed crops grown across India. Farmers depend on it for both income and household consumption. However, one of the major challenges in groundnut farming is the occurrence of leaf spot disease. This disease can reduce the plant’s strength, affect pod formation, and finally bring down the yield. Managing leaf spot effectively requires a combination of good farming practices, timely observation, and proper use of fungicides. Understanding the symptoms and control measures can help farmers protect their crop and avoid major losses.
Leaf spot in groundnut mainly appears in two forms: early leaf spot and late leaf spot. Both are caused by different fungi, but the damage they cause is quite similar. Early leaf spot usually shows small, brown lesions with a yellow margin. Late leaf spot lesions are darker and appear mostly on the upper surface of the leaves. As the disease progresses, the spots increase in number, leaves turn yellow, and eventually fall off. Excessive leaf drop reduces the plant’s ability to produce food, which directly affects pod development.
Effective management starts with field hygiene. Farmers should avoid leaving infected plant debris in the field after harvest. These infected remains can carry fungal spores and infect the next crop. It is better to remove the residues or plough them deep into the soil. Crop rotation is another useful practice. By rotating groundnut with cereals like maize or sorghum, the disease cycle can be reduced because the fungus does not survive well on non-host crops.
Selecting resistant or tolerant varieties is one of the best long-term solutions. Many improved varieties have been developed to withstand leaf spot disease to a good extent. Farmers should check with their local agricultural department or Krishi Vigyan Kendra for the best varieties recommended for their region.
Proper spacing and good aeration in the field help reduce humidity around the plants. Leaf spot fungi thrive in warm and moist conditions, so keeping the crop well-ventilated can slow down the disease. Farmers should also avoid overhead irrigation during evenings, as moisture on the leaves overnight encourages fungal growth.
Nutrient management is another important factor. A healthy crop is naturally more resistant to diseases. Applying balanced fertilizers, especially those containing nitrogen, phosphorus, and potassium, helps the plants grow stronger. Soil application of gypsum and organic matter also improves plant health and reduces stress.
Chemical control becomes necessary when the disease pressure is high. Farmers should start spraying fungicides as soon as the first symptoms appear. Spraying should be done at 10–15 day intervals depending on the severity. Commonly used fungicides include chlorothalonil, mancozeb, carbendazim, and hexaconazole. It is important to rotate fungicides to avoid resistance buildup. Proper spray coverage on both sides of the leaves ensures better protection.
Integrated management, which combines cultural practices, resistant varieties, and timely sprays, is the most effective approach. With regular monitoring and proper decisions, groundnut farmers can successfully manage leaf spot disease and maintain good yields season after season.
