BY: Y. J. P. K. MITHRASENA, W. P. ADHIKARI and D. L. WICKRAMASINGHE
Sheath blight disease of rice caused by the fungus Rhizoctonia solani Kuhn, is becoming a major disease problem in the low country wet zone where environmental conditions are ideal for its spread. The disease has characteristic lesions and in severe cases could completely dry-up the leaves. Some farmers" practices aimed at other targets very often lead to higher sheath blight incidence. Some of these practices have been evaluated at the Regional Agricultural Research Centre, Bombuwela during the last few years and this paper reports the results of these investigations.
These experiments have indicated that sheath blight disease at high severity levels causes reduction in yield mainly due to empty earheads. High densities of sowing as well as nitrogen doses higher than the Department of Agriculture recommendation have resulted in higher disease Incidence. There has been no effect on disease Incidence due to Incorporation of straw, whether Infected or uninfected. Two fungicides, Pencycuron (Monceren) and Tri phenyl tin hydroxide (Duter) have effectively controlled the disease.
Sheath blight disease of rice caused by the fungus Rhizoctonia solani Kuhn, is becoming a major disease problem in the low country wet zone where environmental conditions are ideal for its spread. The disease has characteristic lesions and in severe cases could completely dry-up the leaves. Some farmers" practices aimed at other targets very often lead to higher sheath blight incidence. Some of these practices have been evaluated at the Regional Agricultural Research Centre, Bombuwela during the last few years and this paper reports the results of these investigations.
These experiments have indicated that sheath blight disease at high severity levels causes reduction in yield mainly due to empty earheads. High densities of sowing as well as nitrogen doses higher than the Department of Agriculture recommendation have resulted in higher disease Incidence. There has been no effect on disease Incidence due to Incorporation of straw, whether Infected or uninfected. Two fungicides, Pencycuron (Monceren) and Tri phenyl tin hydroxide (Duter) have effectively controlled the disease.
Yangzhou pioneer chemical CO.,LTD
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