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Status and weed hosts of Rhizoctonia solani causing sheath blight of rice in Haryana



Status and weed hosts of Rhizoctonia solani causing sheath blight of rice in Haryana







Sheath blight of rice (Oryza sativa L.) caused by Rhizoctonia solani Kuhn, earlier considered to be minor, has now attained the status of a major disease in Haryana. The roving surveys conducted in paddy growing areas indicated that the severity of the disease increased after 1995, particularly after 2005. During Kharif 2010, the disease appeared in severe form particularly in PR 114, CSR 30 and Pusa Basmati-4 and the symptoms of sheath blight were observed upto flag leaves with abundant fungal sclerotia and discoloured/chaffy grains, resulting in lodging and withering of the crop in patches resembling hopper burn patches in extreme cases. Out of 26 weed species tested, 22 were found to be infected by sheath blight pathogen on artificial inoculation while four weeds viz. Erigeron sp. (Horse weed), Ipomea aquatica (Ivy-leaved morning glory/Sarnali), Calotropis procera (Swallow wort/Madar/Ak) and Aeschynomeme indica (Indian joint vetch) were not infected. Among the infected weed species.

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Related references

Dicot weed hosts of Rhizoctonia solani causing sheath blight of rice. Indian Journal of Microbiology 20(1): 49-50, 1980

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