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Abstract
Rapeseed – mustard is one of the most important cruciferous oilseed crops basically raise for oils and vegetables to meet domestic consumption of marginal farmers during rabi season in Manipur. Field experiments were conducted under organic condition for two consecutive years ( 2014 & 2015) during rabi seasons at Kakching. Weekly surveys detected white rust of rapeseed –mustard on the four varieties used. Amendments of agronomic practices including sowing dates, intercropping and plant density besides addition of soil with FYM (Farmyard Manure) were found effective on fungal disease of the crop. The disease parameters were monitored through disease incidence (DI) and disease severity (DS) assessment technique. The least disease severity (9.57%) was found in plant density followed by date of sowing (11.06%) and intercropping (12.29%). White rust caused by Albugo candida attacked the crop from mild to severe form and the effect of agronomic practices applied were significant in controlling the white rust disease of the crop.
Highlights
Rapeseed– mustard is one of the most important cruciferous crops
Seeds were sown in the last week of October except for date of sowing (DOS) experiment in plots [(2.2 X 1.3) m2] keeping some border line with three replications and raised under irrigated condition using farmyard manures(FYM) as done by traditional farmers starting from September to November
It may be accounted that intercropping helps to avoid inter-crop competition and a higher number of crops can be grown per unit area at a time which enables efficient resource utilization and increased productivity probably by minimizing disease level
Summary
Rapeseed– mustard is one of the most important cruciferous crops. This crop is basically cultivated for oils and vegetables during winter season in Manipur. More than 30 diseases are known to occur on Brassica crops including rapeseed– mustard in India[1]. The major constraints of rapeseed– mustard is fungal diseases, of which white rust is the most common. Includes crop rotation, utilization of disease free seeds, burning of infected plant debris, soil solarization, sowing date, intercropping, plant density etc.
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