Abstract
Abstract A description is provided for Xanthomonas oryzae pv. oryzicola . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Oryza sativa, Oryza spp. ; Leersia spp., Leptochloa filiformis, Paspalum orbiculare, Zizania aquatica, Z. palustris and Zoysia japonica ( Poaceae ). DISEASE: Bacterial leaf streak of rice. The bacterium enters leaves through stomata and wounds (particularly those from insect attack) and multiplies in the sub-stomatal cavity and intercellular spaces in the parenchyma. Eventually, parenchyma is replaced by bacterial masses. Narrow, dark greenish, water-soaked streaks of various lengths appear between the veins. Minute amber droplets of bacterial exudate are commonly found on these lesions. Later the lesions extend and coalesce, giving large brownish patches. There are no records of symptoms on infected seeds. In the late stages symptoms are difficult to distinguish from bacterial leaf blight, lesion margins remaining linear rather than wavy as for the latter. Infection is favoured in rainy conditions or during periods of high humidity. GEOGRAPHICAL DISTRIBUTION: AFRICA: Madagascar, Nigeria, Senegal. ASIA: Bangladesh, Cambodia, China (Fujian, Guangdong, Hainan, Hunan, Taiwan, Zhejiang), India (Bihar, Karnataka, Madhya Pradesh, Maharashtra, Uttar Pradesh, West Bengal), Indonesia (Java, Kalimantan, Sulawesi, Sumatra), Laos, Malaysia (Peninsular Malaysia, Sabah, Sarawak), Myanmar, Nepal, Pakistan, Philippines, Thailand, Vietnam. AUSTRALASIA: Australia (Northern Territory). EUROPE: Russian Federation. TRANSMISSION: Seedborne. There is some evidence of survival on crop debris and in association with weeds. The pathogen spreads within a crop in surface moisture, irrigation water, rain, etc. There is some evidence that the disease cycle can be broken by sowing summer seed in the winter season as it is thought the pathogen cannot become established during the cool, dry, winter weather (RAO, 1987).
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