Kan thaithot rok lae kan chamnaek saiphan khong chua ra Ustilago scitaminea Syd. sahet rok saedum khong oi.
1991
Leutwit Sasipreyajun
Seed transmission of sugarcane smut caused by Ustilago scitaminea Syd. via seed cane of 5 cultivars was investigated. The transmission percentages were 61.93 % and 71.08 % in plant cane and in ratoon cane, respectively. The highest percentage was found in cv. E-heaw which was 95.83 % in either plant cane or ratoon cane. The partially infected seed cane occurred only 9.35 % in cv. Cassius. The disease severity of sugarcane smut under field condition was observed at collection of Kasetsart University (KU) and Central Sugarcane Agricultural Center at Kanchana Buri (CSACK). Resistant reaction was observed in 102 from 200 cvs. in plant cane at KU. and 88 from 197 cvs. and 114 from 356 cvs. from ratoon cane at KU and CSACK, respectively. The sugar content of the smut infected cane was decreased 17.10 % and 43.27 % compared to healthy cane. Race identification by using biochemical characters of 18 isolates of U. scitaminea was studied in 4 isozyme systems. Two different zymogram patterns of esterase, 6 and 7 bands, were found. Four isolates had 6 bands of esterase where the other fourteen isolates had 7 bands. Two bands of glucose-6-phosphate dehydrogenase were similar in all 18 tested isolates, whereas no peroxidase and leucine amino peptidase was observed in this study.
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