Bacterial blight

Causal organism: Xanthomonas oryzae cv. Oryzal

• High temperature upto 30°C favours the disease development while it subsides at temperature 20°C.
• Lesions enlarged and leave dies faster at higher temperature.
• High rates of nitrogen fertilizer favour the incidence of disease.
• Phosphorus and potassium deficiency and excess silica and magnesium also increase disease incidence.

Management

• Use seed from disease free crop.
• Drain away the water from fields as frequently as possible.
• Grow tolerant varieties such as IR-20, IR-54, IR-64, Pusa2-21, Ajaya, Asha and Daya.