简介：Riceleaffolder,Cnaphalocrocismedinalis,isoneofthemajorfoliagefeedersfoundinthericegrowingregionsinIndia.Whenthecropwasatmaturity,numerousadultsofriceleaffolderwerefoundinthericefieldsthoughthelarvalpopulationgraduallydecreased,andnoeggswerefoundonriceleaves.ThepopulationcharacteristicsofC.medinaliswereassessedbasedonthephysiologicalagestatusofadultsatdifferentcropgrowthstages.Basedoneggdevelopmentwithinovarioles,ovarioleappearance,numberandcolouroffatbodies,andcharacteristicsofbursacopulatrix,physiologicalagestatusoftheadultswasdescribed,whichservedasabasisforthedeterminationofagecomposition.C.medinalisadultswerefoundduringthefirstweekofAugustonriceplants,ofwhich44%wereinAge0withimmatureovaries,indicatingimmigrants.However,28%adultseachwereatAges1–2withdevelopingovaries,indicatinglocalbreedingpopulation.Thecarryoverandoff-seasonsurvivalofC.medinaliswerealsostudiedtodeterminethecontributionofthealternativehostsinthepopulationgrowththathelpedindevisingefficientmanagementstrategies.RicewasthemostpreferredhostfollowedbyTriticumaestivum,EchinochloacrusgulliandBrachiariaplantaginea.VariousroutesofthecarryoverofC.medinalisfromseasontoseasonwerediscussed.