Occurrence and significance of spot blotch in Bangladesh
1998
Alam, K.B. | Banu, S.P. | Shaheed, M.A. (Bangladesh Agricultural Research Institute, Joydebpur, Gazipur (Bangladesh))
Spot blotch, caused by Bipolaris sorokiniana, is a destructive disease of wheat in the rice- based cropping system of Bangladesh. The disease has the potential to be epiphytotic on the wheat variety Kanchan, which covers 85 percent of the total wheat area in the country. The disease appears at the seedling stage and increases in severity with plant age. Incidence of the pathogen in grain is common. At the present time, almost all released varieties in Bangladesh show varying degrees of spot blotch susceptibility but no germplasm has been found to be highly resistant. Yield losses in varieties Akbar, Agrahni, Kanchan, Sawgat, and Sonalika were 16.7 percent, 9.7 percent,19.0 percent, 23.0 percent, and 23.6 percent, respectively. In the 1991/92-1993/94 wheat seasons, the average wheat yield loss due to spot blotch was estimated at 14.9 percent. Variability among R. sorokiniana isolates collected from different locations in Bangladesh has been studied.
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