Studies on etiology and management of root rot of papaya
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Date
2015
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Rajendra Agricultural University, Pusa (Samastipur)
Abstract
In the present investigation papaya root rot was found to cause 60-95 per cent disease incidence resulting in failure of crop in the state. Fusarium solani was established as a causal organism of root rot of papaya in Bihar. Disease incidence was found to decrease with increasing plant spacing. June – July planted crop was found to favour the disease development while March-April planted crop recorded low disease incidence and higher fruit yield. Potato dextrose agar was found appropriate media for proper growth of pathogen whereas sporulation (macro conidia) was favoured in Carnation leaf media. Among native and commercial bioagent tested against the pathogen, Trichoderma viride (native) was found most effective in suppression of the pathogen. Among botanicals, Adenocalymma alliaceum (wild garlic) was found highly effective in checking the development of disease under sick pot condition. Among fungicides, carbendazim and thiophanate methyl showed good efficacy in checking the growth of pathogen in vitro. Again, among fungicides, thiophanate methyl showed best compatibility with Trichoderma viride in vitro. All the oil cake- mustard cake, neem cake, castor cake were found compatible with Trichoderma viride, but mustard cake was also found to be the efficient inhibitor of the pathogen. The most effective treatment for the management of disease was integration of disease free seedling + mustard cake (10%)+wild garlic (10%)+dipping of seedlings in thiophanate methyl (0.1%) for 30 min. + soil drenching with thiophanate methyl (0.1%) solution three times, 1st at time of transplanting, second at 3rd month after transplanting (MAT) and third at 5th MAT+ soil application of Trichoderma viride @50g/plant three times 1st at time of transplanting, second at 3rd MAT and third at 5th MAT+ soil application of Pseudomonas florescence @ 50g/plant three times 1st at time of transplanting ,second at 3rd MAT and third at 5th MAT.
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