Abstract
International Journal of Multidisciplinary Studies (IJMS) is published by the Faculty of Graduate Studies - University of Sri Jayewardenepura. IJMS provides a supportive environment for multidisciplinary researchers to publish their contribution to the academy of knowledge and wisdom. Focus of the journal is on multidisciplinary research which should cover at least two distinct disciplines.
Highlights
The Sri Lankan economy is primarily based on agriculture
It was evident that all the doses elicited significantly higher repellent actions after an hour from the weevil exposure when the leaf powders were used in both contact and vapor forms in comparison to the control which gave no repellency at all
Even the lowest dose of 1 g was able to produce over 50% fumigation repellent activity within an hour indicating the strong effectiveness of R. graveolens leaf powders as fumigants
Summary
The Sri Lankan economy is primarily based on agriculture. Among many food crops cultivated, rice constitutes the main crop in Sri Lanka and the staple food of Sri Lankans which is more importantly the livelihood of more than 800,000 farm families (Dharmasena & Abeysiriwardena, 2003).In spite of the growth of paddy production, considerable losses are reported to occur throughout the production process, and post harvest losses account for 15% of the total loss (Palipane, 2000). The most significant loss in the post harvest operations occurs during storage of paddy and rice, and is caused by improper and inadequate facilities, at farm level (Adhikarinayake, 2005). Rice weevil (Sitophilus oryzae), grain moth (Sitotroga cerealella), and red flour beetle (Tribolium casteneum) are three devastating insect pests of stored paddy and rice in Sri Lanka (Wijayaratne et al, 2009). Rice weevil (Sitophilus oryzae) is considered as the major stored pest of paddy and rice all over the world (Suvanthni et al, 2012). The control of rice weevil infestations has been primarily through the use of fumigants and residual chemical insecticides to augment the more obvious approach of hygiene. The use of plants in the protection of stored grains against insect infestation has been as age-old practice among small-scale farmers in Sri Lanka. Plant leaves of Ocsimum sancturm (Maduruthala), Azadirichta indica (Neem), Citrus spp., Vitex negando (Nika), Curcuma longa (Amukaha), Eucaliptus terreticornis have been used at 1% dose rate for insect control in storage of grains (Palipane, 2000)
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