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Field experiment was conducted to study the seasonal incidence of spotted pod borer, Maruca
vitrata on green gram at Regional Agricultural Research Station, Lam, Guntur during rabi, 2014-
2015. The larval incidence of M. vitrata was observed from 33 days after sowing (DAS) i.e., second
week of November on green gram and continued till the end of the crop growth. The peak larval
incidence was observed at 53 DAS i.e., first week of December coinciding with peak flowering and
pod development stage, thereafter the larval population declined gradually. The pest has
disappeared by the maturity stage of green gram. The weather parameters namely maximum
temperature, minimum temperature, rainfall, morning relative humidity and evening relative
humidity together accounted for 63.38 per cent significant variation in larval population of M.
vitrata. However the correlation between the weather factors and M. vitrata larval population
revealed that maximum temperature, minimum temperature and morning relative humidity showed
positive influence where as rainfall and evening relative humidity showed negative influence.
However, none of them were significant except maximum temperature.
Key words: Seasonal incidence, spotted pod borer, Maruca vitrata, % pod damage, green gram