Evolution of aerial infection of leaf scald caused by Xanthomonas albilineans (Ashby) Dowson in sugarcane
| MSI99P2028 | |
| Saumtally, S. Médan, H. Autrey, L. J. C. | |
| Evolution of aerial infection of leaf scald caused by Xanthomonas albilineans (Ashby) Dowson in sugarcane | |
| XXXII ISSCT Congress, Cartagena, Colombia, Col, 5-13 September 1995 | |
| Periodical article | |
| 1995 | |
| International Sugar Journal | |
| 97(1161), A9 | |
| Abstract published in the joint issue of International Sugar Journal 97, no. 1161, September 1995, vol 97 no. 1162, October 1996, and Sugar Cane, September/October 1995. Abstract also published in Sugar Cane 1995 (6): 24-25. | |
| En | |
| En | |
| The progress of aerial foliar stripes of leaf scald in sugarcane caused by Xanthomonas albilineans was followed in variety M 695/69. Stripes induced by the pathogen, and starting from necrotic areas at the tip of the leaf, were observed five months after planting. They developed on leaves 5 to 14, with a higher frequency on leaf 8 and leaf 9 (the youngest unrolled leaf being taken as leaf 1). Some stripes progressed faster than others and five months after the first infection was recorded, the length of stripes in the trial varied from less than 1 cm to 80 cm and spanned the whole length of a few leaves. The evolution of the stripes could not be followed further as the old leaves bearing symptoms (usually leaf 14) dried up before the stripes entered into the leaf sheaths. However, it was evident that the disease had entered the systemic phase of the disease as leaf scald was observed on young regrowths. In the same experiment, half of the plants were sprayed weekly with copper oxychloride at 1kg a.i./ha in an attempt to control aerial transmission. This dosage was reduced to 0.5 kg a.i/ha after six months due to phytotoxic effects. Stripes were observed in the treated plots when the dosage was changed, but they were still appreciably less than in untreated plots. The percentage of infected stools was reduced from 67 to 11 per cent in in vitro plantlets and from 41 to 17 in plants issuing from one-eye cuttings. The experiment shows that the aerial phase of leaf scald is similar to that of gumming disease of sugarcane and plantations established with clean planting material may become infected through the air-borne inoculum of X. albilineans. | |
| SUGARCANE XANTHOMONAS ALBILINEANS DISEASES LEAF SCALD | |
| MAURITIUS | |
| Sugarcane: Diseases and disease management | |
| 1995-09-26 | |
| En | |
| LIB | |
| CAT | |
| PATH |