Journal of Food, Agriculture and Environment

Repellent and toxicity of crude plant extracts on saw-toothed grain beetle (Oryzaephilus surinamensis L.) 

Author(s):

Mohamed H. Madkour ¹*, Ahmed A. Zaitoun ², Fatma A. Singer ³

Recieved Date: 2013-01-14, Accepted Date: 2013-04-28

Abstract:

Acetonic plant extracts of Rhazya stricta, Lantana camara, Vernonia cinerea, Withania somnifera and Argemone ochroleuca were tested in the laboratory for their insecticidal and repellent effectiveness to saw-toothed grain beetle, Oryzaephilus surinamensis (L.). Four concentrations of each plant extract, 200, 300,400 and 500 ppm were tested. Larvae and adult beetles were exposed to plant extracts for 6 days. Percentage of mortality  was recorded after 2, 4 and 6 days from exposure. The repellent effect of the previous plant extracts was also, studied. All of these  plant extracts showed remarkable toxicities. Complete mortality of O. surinamensis was achieved by L camara and R. stricta at the concentration of 500 ppm for both larvae and adult beetles. The rest of plant extracts increased mortality with increasing of concentrations. Of five plant extracts, the effect of L. camara and R. stricta were relatively more pronounced with LC₅₀ values of 200.58 and 230, 25 ppm, respectively, two days from treatment. Corresponding LC₅₀ values after six days exposure for larva, values were 104, 61 and 115, 78. For adult, the LC₅₀s values after 2 days were 209.09 and 235.56. After 6 days, LC₅₀s were 113.30 and 122.18, respectively. Moreover, R. stricta and L. camara exhibited high repellency 97% and 100% at concentration of 500 ppm against O. surinamensis adults. The application of these extracts may be promising in protecting of stored date and grains against the attack of O. surinamensis specially extracts of L. camara and R. stricta. 

Keywords:

Oryzaephilus surinamensis, saw-toothed grain beetle, acetonic extracts, Rhazya stricta, Lantana camara, Vernonia cinerea, Withania somnifera, Argemone ochroleuca, lethal concentration

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 2
Category: Agriculture
Pages: 381-384

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