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1 June 2012 Efficacy of Natural Products Against Callosobruchus chinensis (Coleoptera: Bruchidae) in Nepal
Homan Regmi, Lekhnath Kafle, Yubak Dhoj Gc, Cheng Jen Shih
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This study was conducted to determine the efficacy of local natural products against the beetle, Callosobruchus chinensis L. (Coleoptera: Bruchidae), in stored chickpea Cicer arietinum L. (Fabaceae) in Chitwan, Nepal. Five natural products and one synthetic pesticide (Malathion) and two storage regimes (aluminum sheet bin vs. jute bags with plastic lining) were tested for their effect on stored pulse with respect to damage by C. chinensis. The five natural products included Xanthoylum armatum DC (Rutaceae) fruit powder, Acorus calamus L. (Araceae) rhizome powder, Cinnamom camphora L. (Lauraceae) balls, oil of Sesamum indicum L. (Pedaliaceae), and leaf powder of Azadirachta indica A. Juss. (Meliaceae). Treatments of stored pulses with natural products or with Malathion all caused significantly higher mortality of C. chinensis at 15 d after treatment (DAT) than stored pulses receiving no treatments. The balls of C. camphora, rhizome powder of A. calamus and sesame oil outperformed all other treatments, including the Malathion at 45 and 75 DAT and resulted in significantly reduced damage or deterioration of stored pulses compared with other treatments. Storage regimes performed similarly, although the jute bags did protect seed integrity for some treatments. Our results indicate that incorporating these natural products into stored pulses can protect the seeds from C. chinensis for up to two generations, something that Malathion cannot do. These products are readily available to most farmers in the region and their use will lead to 1) reduction of losses to significant stored product pests, and 2) a reduction of contamination of foodstuffs and the environment by synthetic pesticides like Malathion.

© 2012 Entomological Society of America
Homan Regmi, Lekhnath Kafle, Yubak Dhoj Gc, and Cheng Jen Shih "Efficacy of Natural Products Against Callosobruchus chinensis (Coleoptera: Bruchidae) in Nepal," Journal of Economic Entomology 105(3), 1095-1099, (1 June 2012).
Received: 16 May 2011; Accepted: 1 January 2012; Published: 1 June 2012

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