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Journal of Biological Sciences

Year: 2005 | Volume: 5 | Issue: 2 | Page No.: 201-204
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Research Article

Leaf Extracts of Shiyalmutra (Blumea lacera Dc.) as Botanical Insecticides Against Lesser Grain Borer and Rice Weevil

B. Roy, R. Amin, M.N. Uddin, A.T.M.S. Islam, M.J. Islam and B.C. Halder

ABSTRACT

Two experiments were conducted in the laboratory with leaves of one plant species (Blumea lacera Dc.) Shiyalmutra or Kukurshunga for studying their repellency and toxicity test against the lesser grain borer (Rhyzopertha dominica F.) and rice weevil (Sitophilus oryzae L.; Bastrychidae:Coleoptera) with the attempt for chemical investigation of each extract. In the first experiment petroleum ether extract of dried leaves (1, 2 and 3% by volume) were used on the adult beetle of lesser grain borer and rice weevil to evaluate their repellency for mortality/direct toxicity effects. Results for the two experiments indicated that 1, 2 and 3% petroleum ether extract of leave of Blumea lacera Dc. species had repellency as well as direct toxicity, while 3% showed strong repellency and toxicity effects among the other extracts on both lesser grain and rice weevil.
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