Malaysian Applied Biology Journal

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37-2-07

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Malays. Appl. Biol. (2008) 37(2): 41–46

EFFECT OF SELECTED PLANT EXTRACT ON MORTALITY OF ADULT Sitophilus zeamais MOTSCHULSKY (COLEOPTERA: CURCULIONIDAE), A PEST OF STORED RICE GRAINS

ASMANIZAR1, A. DJAMIN1 and IDRIS, A.B.2

1Islamic University of North Sumatra, Faculty of Agriculture, Department of Plant Protection, Medan 20217 Indonesia
2 School of Environmental and Natural Resource Sciences, Faculty of Science & Technology, Universiti Kebangsaan Malaysia 43600 Bangi, Selangor, Malaysia
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ABSTRACT

A preliminary study was conducted to test 16 crude extracts of selected plants on the mortality of Sitophilus zeamais adult. The bioassay was carried out by mixing crude extracts with rice grain at 0.5 and 0.25% concentrations by weight. It was found that crude extracts of Jatropha curcas (seed) and Annona muricata (seed) caused 100% mortality on weevil at 0.5% concentrations while at 0.25% they caused 96.7 and 98.3% mortality respectively. Crude extract of J. curcas (leaf) and Azadirachta indica (seed) at 0.5% caused 81.7 and 51.7% mortality respectively, while at 0.25% the mortality was 55% and 25%, respectively. Crude extracts of J. curcas seed and leaves, A. muricata (seed) and A. indica (seed) seem to have potential as botanical insecticides but further studies need to be conducted against S. zeamais.


ABSTRAK

Satu kajian awal untuk menguji kesan 16 ekstruk krud tumbuhan terpilih terhadap kematian S. zeamais dewasa telah dijalankan. Bioassei dilakukan dengan mencampurkan ekstrak krud dengan beras pada kepekatan extrak krud 0.5 dan 0.25%(mengikut berat). Didapati ekstrak Jatropha curcas (biji) dan Annona muricata (biji) telah menyebabkan 100% kematian kumbang pada kepekatan 0.25%, sementara pada kepekatan 0.25% kematian adalah masing- masingnya 96.7 dan 98.3%. Pada kepekatan 0.5% ekstark krud J. curcas (daun) dan Azadirachta indica (biji) kematian kumbang masing-masingnya adalah 81.7 dan 51.7, sementara kepekatan ekstrak 0.25% telah menyebabkan kematian kumbang masing-masingnya 55% dan 25%. Kajian ini menunjukan bahawa biji dan daun J. curcas, biji A. muricata, dan biji A. indica berpotensi di bangunkan sebagai racun serangga botanical, namun kajian selanjutnya perlu dilakukan.

Key word: Sitophilus zeamais, rice grain, stored product pest, Coleoptera, Curculionidae

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