INDIAN JOURNAL OF PURE & APPLIED BIOSCIENCES

ISSN (E) : 2582 – 2845

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Indian Journal of Pure & Applied Biosciences (IJPAB)
Year : 2019, Volume : 7, Issue : 5
First page : (138) Last page : (146)
Article doi: : http://dx.doi.org/10.18782/2320-7051.7629

Epidemiological Studies, viz. Effect Of Soil Temperature, Moisture, Electrical Conductivity (EC), Soil pH on Sclerotium rolfsii  Sacc.
Causing Sclerotium Wilt or Rot in Potato and Its Survival and Host Range

Kulkarni V. R.* and Hegde Y. R.
Department of Plant Pathology, College of Agriculture, Dharwad
University of Agricultural Sciences, Dharwad-580005, Karnataka. India
*Corresponding Author E-mail: kulkarnivr@uasd.in
Received: 13.07.2019  |  Revised: 17.08.2019   |  Accepted: 25.08.2019  

 ABSTRACT

Sclerotium wilt/ rot of potato caused by Sclerotium rolfsii Sacc. is one of the major soil borne diseases of potato causing heavy losses every year. To know the epidemiology and to develop suitable management practice the study was carried out. The results revealed that, Four per cent inoculum level was necessary to get 100 per cent infection. The maximum per cent germination of sclerotia (87.50%) was noticed at 1 cm depth, which gradually reduced with increase in depth. The germination of sclerotia was 100 per cent upto one month after the storage and it gradually decreased with increase in storage duration.
The rate of movement of mycelia at low inoculum level (one sclerotia) started its movement very slowly and took eight days to reach maximum distance of 9 cm, whereas, the rate of movement was visible on 2nd day itself in high inoculum (five sclerotia) and reached maximum of 9 cm distance on 6th day only. Colonization of sorghum seeds and germination of sclerotia were drastically reduced with increase in EC levels of soil. The fungus made maximum growth and germination of sclerotia at 30o C. The optimum soil temperature for the growth of S. roflsii and germination of sclerotia was found between 25-30o C.
The maximum saprophytic activity of the fungus and germination of sclerotia were found at 30 per cent soil moisture level, the fungus showed moderate to good growth over a pH range of 5.5 to 9.0.  Maximum fungus colonization on sorghum baits was recorded at pH 6. Highest germination of sclerotia was observed at pH of 5.5.

Keywords: Sclerotium rolfsii, Sclerotia, Soil moisture, Soil temperature, pH

Full Text : PDF; Journal doi : http://dx.doi.org/10.18782

Cite this article: Kulkarni. V. R. & Hegde, Y. R. (2019). Epidemiological Studies, viz. Effect of Soil Temperature, Moisture, Electrical Conductivity (EC), Soil pH on Sclerotium rolfsii Sacc. Causing Sclerotium Wilt or Rot in Potato and Its Survival and Host Range, Ind. J. Pure App. Biosci.7(5), 138-146. doi: http://dx.doi.org/10.18782/2320-7051.7629




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