Bacterial Blight of Rice

Disease

Bacterial Blight of Rice

Xanthomonas oryzae pv. oryzae

bacteria

In a Nutshell

    Light green to greyish-green water-soaked streaksLarge yellowish-white lesionsWhole leaves can turn whitish or grey

Hosts: %1$s

· Rice

Symptoms

On the leaves of rice, light green to greyish-green water-soaked streaks appear. Later, these lesions merge and form larger yellowish-white lesions with uneven edges. In the final stage of infection with Bacterial Blight, rice leaves are covered with a white to grey fungal layer. The leaves starts to wilt and die. In the morning, you can observe milky dew drops of bacterial masses on young lesions - they dry up and leave a white encrustation.

Trigger

The bacteria are spread by wind and rain splash or irrigation water. Favorable factors for the spread of the disease are high humidity, strong wind and temperatures of 25°C to 30°C. High nitrogen fertilization also favors the diseases.

Biological Control

Biological control of Bacterial Blight is relatively recent and not currently in common use.

Chemical Control

To combat Bacterial Blight, apply Streptomycin sulphate and a Tetracycline combination 300g plus Copper Oxychloride 1.25 Kg/ha.

Preventive Measures

    Plant resistant rice varieties like IR 20 and TKM 6Crop management measures like water control, avoidance of damage to seedlings, optimal drainage are effectiveDestroy and remove weed hostsBurn crop residuesAdjust nitrogen fertilizer applications to about 80-100 kg N/ha




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