The role and pathogenicity of various sorghum root and stalk rot pathogens under greenhouse conditions in India

Karunakar, R I and Satyaprasad, K and Rao, P R and Pande, S (1993) The role and pathogenicity of various sorghum root and stalk rot pathogens under greenhouse conditions in India. Phytophylactica, 25. pp. 263-267. ISSN 0370-1263

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Abstract

The pathogenic role of fungi in sialk rot development was assessed from the inoculated roots and stalks of sorghum. Isolation from inoculated plants consistently yielded Fusaria—mainly from the roots 20 d after inoculation—while Macrophomma phaseolina was isolated mote frequently from the stalks and infecicd the roots only after flowering. Lodging of all plants by physiological maturity followed inoculation with M. phaseolina, compared to 89 % lodging following inoculation with F. moniliforme and F. oxysporum. Mycelial spread, pith disintegration and vascular bundle separation in the stalks and the degree of root colonization were more severe in M. phaseolina and F. moniliforme-infecied plants than in plants infected only with F. oxysporum and F. subglutinans F semitectum produced only mild symptoms. The results suggest that the Fusarium spp. are early colonizers in the stalk rot disease complex, while St. phaseolina colonizes the plants at a latter stage of growth. M. phaseolina and F. moniliforme were more pathogenic to sorghum than F. oxysporum and F. tubglutinans, while F semitectum was found to be weakly pathogenic.

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Subjects:	Mandate crops > Sorghum
Depositing User:	Library ICRISAT
Date Deposited:	11 Dec 2011 07:24
Last Modified:	11 Dec 2011 07:24
URI:	http://oar.icrisat.org/id/eprint/4868
Official URL:
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	UNSPECIFIED
Links:	Author

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