Sure, here is an article on Sheath blight in paddy:
Sheath blight, also known as “web blight” or “false smut”, is a common fungal disease that affects paddy crops. This devastating disease is caused by the fungus Rhizoctonia solani and can lead to significant yield losses if not managed properly.
The symptoms of sheath blight typically appear in the early stages of crop development as small, water-soaked lesions on the leaf sheaths near the waterline. These lesions quickly enlarge and form elongated, dark brown lesions that encircle the stem, causing the affected parts to become dark and shriveled. In severe cases, the fungus may also produce a white cottony growth known as mycelial strands.
Sheath blight thrives in warm and humid conditions, making it a serious threat to paddy crops in tropical and subtropical regions. The disease spreads rapidly through the crop canopy, especially during periods of high humidity and rainfall. Overcrowded and poorly drained fields with dense plant populations are particularly susceptible to sheath blight infection.
To effectively manage sheath blight in paddy crops, farmers can adopt several preventive measures. Proper field sanitation, including the removal of infected plant debris, can help reduce the spread of the fungus. Planting disease-resistant varieties and practicing crop rotation can also help minimize the risk of sheath blight outbreaks.
Chemical control measures, such as the application of fungicides, may be necessary to manage severe sheath blight infections. Fungicides should be applied preventively or at the first sign of disease symptoms to protect the crop from further damage. It is important to follow proper application procedures and rotate between different fungicides to prevent the development of resistance in the fungal population.
In conclusion, sheath blight is a serious fungal disease that can significantly impact paddy crops if left unchecked. By implementing good agricultural practices and timely management strategies, farmers can effectively control sheath blight and protect their yields from this destructive disease.