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A new isolate of Sclerotium rolfsii Sacc. causing bulb rot in onion (allium cepa L. variety Poona red)

Authors:

Niranjani Ramanathan ,

Central Agricultural Research Institute, Gannoruwa, Perudeniya, LK
About Niranjani
Division of Plant Pathology
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B. Sivakadacham,

University of Jaffna, Jaffna, LK
About B.
Department of Botany
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K. Theivendirarajah

University of Jaffna, Jaffna, LK
About K.
Department of Botany
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Abstract

The causative fungus of a hitherto unreported bulb rot cusease of onion (Allium cepa L. variety Poona red) was found to be Sclerotium rolfsii Sacc. The vegetative propagative structures of the fungus known as sclerotia, were able to germinate within 24h on a suitable substratum and produce new colonies. The fungus took about ten days to produce fresh sclerotia from germinating sclerotia, under laboratory conditions. The fungal isolate obtained from infected onion plants (Sclerotium rolfsii - Isolate 5) had a temperature optimum of 35% for germination of sclerotia. It showed luxurious growth and maximum amount of sclerotial production at temperatures between 30 and 350 C. The fungus was able to survive in a wide range of pH conditions (pH 3 to 9) but had an optimum pH of 5.5 for germination of sclerotia and radial growth.
How to Cite: Ramanathan, N., Sivakadacham, B. and Theivendirarajah, K., 1988. A new isolate of Sclerotium rolfsii Sacc. causing bulb rot in onion (allium cepa L. variety Poona red). Journal of the National Science Foundation of Sri Lanka, 16(2), pp.183–194. DOI: http://doi.org/10.4038/jnsfsr.v16i2.8250
Published on 28 Dec 1988.
Peer Reviewed

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