Resumo

OBREGON BARRIOS, Mónica; RODRIGUEZ GAVIRIA, Paola Andrea; MORALES OSORIO, Juan Gonzalo  e  SALAZAR YEPES, Mauricio. HOSTS OF Ralstonia solanacearum ON BANANA AND PLANTAIN PLANTATIONS IN COLOMBIA. Rev. Fac. Nac. Agron. Medellín [online]. 2008, vol.61, n.2, pp.4518-4526. ISSN 0304-2847.

The moko disease caused by the bacterium Ralstonia solanacearum race 2, is one of the most limiting phytosanitary problem to deal with in plantain and banana production in Colombia .  The bacterium has a wide host range, nearly 50 botanical families and over two hundred species.  In plantain and banana plantations in Colombia this bacterium has been associated with asymptomatic weeds found in high populations which facilitates the survival and permanence in the field.  To determine the wild symptomatic and asymptomatic host in affected areas of banana and plantain plantations in el Valle del Cauca, Quindío and Urabá, it was carried out the collection of frequent weeds around the infected focus and isolatioin of the bacterium in SMSA culture medium. 124 isolates were subjected to biochemical and pathogenicity test in plantain and banana plants under environmental conditions in El Valle del Cauca and Urabá. In the pathogenicity test 67 out of 124 that were evaluated were positive, showing the typical symptoms such of the disease such as: wilting, chlorosis, leaf yellowing and dead plants. New bacterial weed host species have been found: Chaptalia nutans, Seneciodes cinerea, Tripogandra glandulosa, Plenax hirtus, Peperomia pellucida, Tripogandra cumanenses, Desmodium sp, and Cissus sicyoides (Vitaceae).  The latter belongs to the Vitaceae family, which corresponds to the report of a new host family. The presence of the bacterium was confirmed in wild host previously reported.

Palavras-chave : Moko disease; musaceas; weeds; inoculum source; survivor; disease symptoms.

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