Studies on Dry root rot [Macrophomina phaseolina (Tassi) Goid.] of Mothbean [Vigna aconitifolia (Jacq.) Marechal] and its Management
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Date
2023-08-03
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Agriculture University, Jodhpur
Abstract
Mothbean [Vigna aconitifolia (Jacq). Marechal] is oldest pulses crop and
affected by dry root rot diseases caused by Macrophomina phaseolina, it causes
heavy yield losses during cropping season. Pathogen having a wide host range,
survive in soil as saprophytic and in form of sclerotia, and management is difficult in
nature, therefore it is a major problem in mothbean growing areas.
The pathogen was isolated from infected root parts and purified by using
hyphal tip cut technique. Proved pathogenicity through Koch’s postulates by using
seed cum soil inoculation techniques and 87.64% disease incidence was observed.
Out of 15 cultivars/varieties none of the variety was found immune against dry root
rot. One variety RMO-2251 was found resistant, six varieties were moderately
resistant, six were moderately susceptible, one was susceptible and salawas local was
found highly susceptible.
To study on effect of cultural media and temperature on growth of M.
phaseolina found highest radial growth and excellent sclerotial formation on PDA and
grew best at 30ºC temperature.
Six fungicides were evaluated in vitro condition against M. phaseolina in
which carbendazim 25% + mencozeb 50% was inhibited complete mycelial growth at
250, 500 and 1000 ppm concentrations.
Among the organic amendments neem cake was found significantly reduced
the dry root rot disease incidence and promote growth ability of mothbean crop.
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Jaimini, Megha 2023. Studies on Dry root rot [Macrophomina phaseolina (Tassi) Goid.] of Mothbean [Vigna aconitifolia (Jacq.) Marechal] and its Management. M.Sc. Thesis, College of Agriculture, Agriculture University, Jodhpur