Xanthomonas albilineans . [Descriptions of Fungi and Bacteria

Abstract

Abstract A description is provided for Xanthomonas albilineans . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Bambusa vulgaris, Coix lacryma-jobi, Cymbopogon citratus, Saccharum officinarum, S. spontaneum, Sorghum halepense, Zea mays ( Poaceae ). Wild hosts: Brachiaria piligera, Imperata cylindrica, Panicum maximum, Paspalum conjugatum, P. dilatatum, Pennisetum purpureum, Rottboellia cochinchinensis ( Poaceae ). DISEASE: Leaf scald of sugarcane, considered to be one of the major diseases of this host. Two disease phases have been recorded: chronic and acute. In the chronic phase a typical white line (1-2 mm wide) runs parallel to the leaf veins almost the entire length of the leaf. Latterly, lines may become diffuse and redden, particularly in the middle of the stripe. Partial or total chlorosis of leaves occurs (scalding) and is accompanied by an inward curling. In the acute phase of the disease, sudden plant death occurs with few or no symptoms. The disease can remain dormant until environmental conditions are favourable for symptom expression. GEOGRAPHICAL DISTRIBUTION: AFRICA: Benin, Burkina Faso, Cameroon, Chad, Congo Democratic Republic, Congo, Ghana, Ivory Coast, Kenya, Madagascar, Malawi, Mauritius, Morocco, Mozambique, Nigeria, Réunion, South Africa, Swaziland, Tanzania, Zimbabwe. NORTH AMERICA: USA (Florida, Hawaii, Louisiana, Texas). CENTRAL AMERICA: Barbados, Belize, Cuba, Dominica, Dominican Republic, Grenada, Guadeloupe, Guatemala, Jamaica, Martinique, Mexico (Vera Cruz), Panama, Puerto Rico, St Kitts & Nevis, St Lucia, St Vincent & Grenadines, Trinidad & Tobago. SOUTH AMERICA: Argentina, Brazil (Säo Paulo, Sergipe), Colombia, Ecuador, French Guiana, Guyana, Suriname, Uruguay, Venezuela. ASIA: Cambodia, China, Taiwan, India (Andhra Pradesh, Uttar Pradesh), Indonesia (Java, Sulawesi), Japan, Malaysia, Myanmar, Pakistan, Philippines, Sri Lanka, Thailand, Vietnam. AUSTRALASIA: Australia (New South Wales, Queensland), Fiji, French Polynesia, Papua New Guinea. TRANSMISSION: Primarily on infected cuttings and fluffs (mature flowers). The use of contaminated tools and harvesters aids local spread. Airborne infection has occurred and wet and stormy conditions are highly conducive to disease spread. Root to root infections have also been recorded (KLETT & ROTT, 1994).