• Volume 28, Issue 6

      December 1948,   pages  177-246

    • Trace element nutrition of fungi - I. The effect of boron, zinc and manganese onFusarium species

      L Yogeswari

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    • The effects op potassium deficiency on rice

      S P Aiyar

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    • Diseases ofPan (Piper betle) in Sylhet, Assam - Part VII. Effects of some soil treatments on the incidence ofSclerotial wilt

      S Chowdhury

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      The results of the experiments carried out during the years 1940-46 to ascertain the effects of some soil treatments on the incidence of theSclerotial wilt ofpan due toS. rolfsii are presented.

      It has been found possible to considerably reduce the percentage of mortality by deep ploughing and by the growing of other crops for a few years on the infested soil. Continuous cropping fot four years withulu grass, paddy or tobacco andmukhi completely controlled the disease.

      Applications of organic manures, cowdung and composts appreciably reduced the percentage of death due to the parasite.

      Turning under of green manures has also been found beneficial in suppressing the disease.

      Applications of zinc sulphate, copper sulphate, ferrous sulphate, manganous sulphate and magnesium sulphate have been found ineffective in minimising or controlling the disease.

      Of the fertilizers tried, ammonium sulphate alone or in combination with superphosphate or potassium chloride or both the latter was found effective in appreciably suppressing the disease. Superphosphate or potassium chloride when applied singly or in combination exerted less effect but kept the mortality always below that observed in the control plots.

      None of the soil amendments tried exerted any influence.

      It may be concluded from these studies that theSclerotial wilt ofpan as it occurs in Assam can be effectively controlled by deep ploughing, by green manuring, by the application of organic manures and fertilizers and by the growing of other crops in the infested fields for a few years.

    • Diseases ofPan (Piper betle) in Sylhet, Assam - Part VIII. Effect of temperature on the development ofSclerotial wilt ofpan

      S Chowdhury

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      The effect of temperature on the growth ofS. rolfsii and the effect of soil temperature on the development of sclerotial wilt ofpan were studied.

      It was found that the optimum temperature for the vegetative growth of the organism in culture was 28° C. and the maximum number of sclerotia was formed at 28° and 30° C. in culture. The optimum temperature for the germination of sclerotia in Dox agar was observed to be 28° C.”

      Optimum soil temperature for the development of the disease was found to be 28° C., although at 25° and 30° C. the disease was quite severe.

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