






Vol.4 , No. 4, Publication Date: Aug. 8, 2017, Page: 74-80
[1] | Mohammod Hossain, Plant Pathology Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh. |
[2] | Md Ansar Ali, Plant Pathology Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh. |
[3] | Mohammad Delwar Hossain, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh, Bangladesh. |
Incidence and severity of blast disease of rice was recorded in ten agro-ecological zones (AEZs) of Bangladesh during Boro (November to May; irrigated ecosystem) and Transplanted Aman (July to December; rain fed ecosystem) seasons. Disease incidence and severity was higher in irrigated ecosystem (Boro season) (21.19%) than in rain fed ecosystem (Transplanted Aman season) (11.98%) regardless of locations (AEZs). It was as high as 68.7% in Jhalak hybrid rice variety followed by high yielding rice cultivar BRRI dhan47 (58.2%), BRRI dhan29 (39.8%), BRRI dhan28 (20.3%) during Boro and in BRRI dhan34 (59.8%) during T. Aman season. Maximum yield loss was noted in AEZ9 for both the seasons. Percent yield loss was higher in all the locations for Boro season (irrigated ecosystem) compared to T. Aman season (rain fed ecosystem). In the crop sequence1 (CS-1= Crop cycle with one rice followed by fallow/other crops) disease incidence was 16.7% and in crop sequence2 (CS-2= Crop cycle with two rice followed by fallow/other crops) it was 31.9%. Most popularly adopted Boro rice was BRRI dhan28 (29.6%) followed by BRRI dhan29 (25.9%) and T. Aman rice was BRRI dhan34 (22.9%).
Keywords
Rice, Blast Disease, Survey, Epidemiology, Yield Lose
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