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Bacterial leaf streak

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1. This is a bacterial foliar disease. The disease first starts on the leaves as small water-soaked to translucent interveinal streaks of 1-10 cm long. They elongate parallel to the veins and turn yellowish brown, which often coalesce to form large blotchy lesions covering the entire leaf Surface. Minute, yellowish orange beads of bacterial exudates appearing all along the lesions is a characteristic feature of this disease. This disease is caused by Xanthomonas campestris pv. oryzicola. The bacterium is a rod shaped, 1.0-2.5 x 0.5-0.8\ in size and motile by single polar flagellum. It is gram negative and non-spore forming bacterium. To eradicate the disease, following steps should be taken 1. Procurement of seeds from authentic source to minimize the seed borne inoculums. 2. Soaking ofthe seeds in 0.025% Streptocycline and hot water treatment at 52°e for 30 minutes . 3. Use of resistant varieties.

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