Suppression of rice sheath blight by recycled paper-multing
2018
Hasegawa, M.
The use of recycled paper-mulching for rice cultivation eliminates the need to use herbicides. The technology of transplanting with recycled paper mulch has been established and used by farmers in Japan. In this study, the use of recycled paper mulch for rice cultivation was evaluated as a means to reduce the incidence of rice sheath blight disease caused by Rhizoctonia solani Kuhn. Under micro paddy conditions, the number of buoyant sclerotia significantly decreased by recycled paper-mulching. As a result, the number of sclerotia of rice sheath blight fungus attached to rice plants dramatically decreased and percentage of affected hills in rice plants remained low during about 100 days growing period of rice plants. However, recycled paper-mulching did not reduce vertical development of rice sheath blight. Similar results were observed in paddy field condition. Under paddy field conditions, percentage of affected hills in rice plants at maturing stage decreased to 30% with respect to untreated by recycled paper-mulching. The effect of Depth of Flooding in control of rice sheath blight by recycled paper-mulching was not obserbed. Per cent germination of sclerotia of rice sheath blight fungus at maturing stage decreased to 50% with respect to untreated by recycled paper-mulching. These results indicate that recycled paper-multing can be used to physical control of rice sheath blight.
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