OAR@ICRISATInsect Antifeedants And Growth Inhibitors From Azadirachta Indica And Plumbago ZeylanicaH CSharmaauthorKLeuschnerauthorA V BSankaramauthorDGunasekharauthorMMarthandamurthiauthorKBhaskaraiahauthorMSubrahmanyamauthorNSultanaauthorSolvent extracts of dlfferent parts of the neem tree (Azadlrachta lndica A. 3uss) were bioassayed for thelr antlfeedant properties agalnst flrst- and thlrd-instar larvae of Mythimna reparata. Fraction 'C', obtalned from an ethanollc extract of the shade-drled neem seeds (Hyderabad, India) was the most effective phagodeterrent under glasshouse, laboratory and, to a 11mlted extent, fleld conditions. Fractlon 'C' was further purlfled to fractlon 'M', whlch was subjected to column chromatography (silica gel) result~ng In IG fractions, AI-l to AI-14. Fractions AI-9, AI-10 and AI-11 were found to be b~olog~calalyc tive, reduclng leaf feedlng and larval weight consrderably. None of the treated larvae whlch fed on leaf dlscs treated wlth the fractions and extracts 'C' and 'M' could pupate. The retentlon tlme of the malor component of AI-10 on a p BONDAPAK C18 10 u, 3.9 mm ID, 30 cm column (hlgh performance liquid chromatography) was close to that of azadlrachtln. Spectral lnvestlgatlons revealed that this major component of A1 1s dlfferent from the antifeedants reported earher from A, indica and Melia azedarach. It has been des~gnated as vepaol (the Telugu name for neem IS vepa), and some aspects of 11s structure are discussed. Studles relatlng to the effectiveness of fraction 'G' on the oriental rmyworm, Mythrmna reparata, and other sorghum pests are presented.Agriculture-Farming, Production, Technology, EconomicsEntomology1983Conference or Workshop Item

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