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- Mayary Torrado-Jaime, Jairo Castaño-Zapata, FRECUENCY OF BLACK AND YELLOW SIGATOKAS ON PLANTAIN (MUSA SPP.) ACCORDING TO THE DEVELOPMENT STAGES OF THE PLANT , Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales: Vol. 32 No. 125 (2008)
- Rocío Alexandra Ortiz-Paz, Carolina González-Cardona, Jairo Castaño-Zapata, ETIOLOGY OF ONION (ALLIUM FISTULOSUM L.) WHITE TIP AT THE FARM TESORITO, MANIZALES-CALDAS , Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales: Vol. 36 No. 140 (2012)
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Abstract
Castor (Ricinus communis L.) has become a very important crop for the industry because it is an alternative for the production of biofuel, besides its multiple uses like castor oil. But, as the planting area increases, several new diseases have been detected. This research was conducted in order to identify the causal agent of the necrosis of the terminal buds or apical death, on the varieties Nordestina and Energía. To the microorganism isolated, pathogenicity tests were conducted to demonstrate Koch’s postulates, and once demonstrated its pathogenicity, its cultural, morphological, and biochemical characteristics were determined. The results showed that the necrosis of the terminal shoots of castor is caused by Xanthomonas campestris, which is manifested by the presence of oily-looking patches of brown or black color in the terminal buds and young leaves, in addition to bacterial exudates. The bacterium was found in the seeds of both varieties tested, contaminating the seed coat and embryo, concluding that the seed is the primary source of inoculum of this disease.
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