Toxicity of three chemical extracts of black pepper fruits against two stored grain insect pests
Journal Title: International Journal of Pharmaceutical Science Invention - Year 2017, Vol 6, Issue 10
Abstract
Three extracted fractions from black pepper fruits, Piper nigrum L, in four concentrations were evaluated for their toxicity effects against stored grain pests, red rusty flour beetle Tribolium castaneum Hbst. and their stages, and Sitophilus oryzae L., the adult rice weevil. The obtained results revealed that the etheric fraction caused higher mortality than that of two other solvent fractions, towards all target pests. The adult rice weevil was the most susceptible, followed by the larvae, adult > eggs > pupae of red flour beetle. The mortality percentage reached to 100% at a concentration 2.5% (w/w) after 21 day of treatment of adult rice weevil, while was 100% at conc. 5% (w/w) in same period in case of adult red flour beetle, and the LC50 between both adult pests were 2.43 and 3.52, respectively. The reduction in F1 progeny in all treatments were greatly significant and was higher than the mortality in low concentrations, ranged from 73% to 100% according to the concentration and insect. By using GC/MS analysis was found a functional groups and compounds in the oil, were determined and identified the main constituents which may cause the mortality, as well as their structures, formulae and percentages. The main components were monoterpenes, Sesquiterpenes, fatty acids and alkaloids, and some of effective constituents were α-pinene, Linalool, α-Copaene, Linoleic acid and Piperin.
Authors and Affiliations
Hussein A. E. , Abd Elhaseeb H. , Mohamed R. A. , Abdel-Mogib M. , Abou Elnaga Z.
Keywords
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