Sheath Blight in Rice Crop (ਉੱਲੀ ਰੋਗ ਸ਼ੀਥ ਬਲਾਇਟ) Shergill Markhai скачать в хорошем качестве

Sheath Blight in Rice Crop (ਉੱਲੀ ਰੋਗ ਸ਼ੀਥ ਬਲਾਇਟ) Shergill Markhai

Symptoms are usually observed from tillering to milk stage in a rice crop and include the following: oval or ellipsoidal greenish gray lesions, usually 1-3 cm long, on the leaf sheath, initially just above the soil or water level in the case of conventionally flooded rice. under favorable conditions, these initial lesions multiply and expand to the upper part of the sheaths, the leaves, and then spread to neighboring tillers belonging to different hills (transplanted rice) or plants (direct-seeded rice). lesions on the leaves usually have irregular lesions, often with gray-white centers and brown margins as they grow older. in subtropical environments, the disease is mostly initiated by sclerotia (up to two million of which can be produced per square meter in a diseased crop). In tropical ecosystems, however, the role of sclerotia in initiating the disease is uncertain. In any case, the pathogen does not produce aerially dispersed spores; its dispersal is essentially dependent on hyphae running on plant tissues and producing new infections Sheath blight has symptoms similar to stem rot and stemborer infestation. To confirm the cause of disease, check for irregular lesions usually found on the leaf sheaths (initially water-soaked to greenish gray and later becomes grayish white with brown margin). Also check for presence of sclerotia.