*Corresponding author's E-mail: disnar@agbio.ruh.ac.lk, disaratnasekera@gmail.com
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Repellent activity of Cinnamon (Cinnamomam verum Presl.) bark oil vapour and Citronella (Cymbopogon nardus L.) oil vapour was evaluated against Callosobruchus chinensis L in bulk stored green gram. Both oils were used at 5ml and 10ml/5kg of seeds in 3L plastic baskets. Oviposition and damaged seeds were observed up to two months. At the end of the storage period, the effect of the treatments on flavour, consumer acceptability and seed germination was evaluated. Both oils inhibited population growth of C. chinensis as compared to untreated seeds. Both oil vapours at 5 and 10ml/5kg protected green grams from infestation by C. chinensis for 2 months. Amongst the two Cinnamon bark oil vapour was more effective than Citronella oil vapour in both concentrations used. No harmful effect was observed on the germination of oil vapour treated seeds. The oil vapour treatments conferred off-flavours to the green grams and product acceptability was compromised by treatment with Cinnamon bark oil vapour at 5ml/5kg.
