Abstract
Rice root-knot nematode Meloidogyne graminicola causes yield losses of up to 18% in rainfed upland rice in eastern India, and seedling blight disease of rice, caused by Sclerotium rolfsii , is seen to be associated with it (Mathur 1973). This observation led to the investigation of the nature and type of association among rice cultivar IR8, M. graminicola , and S. rolfsii . Samples of IR8 plants with an intact root system and rhizosphere soil collected from the 0-5-cm depth of a rainfed upland rice field served as a source of inoculum for the greenhouse experiments.
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