Acaricide effect of some extracts and fractions on Tetranychus urticae Koch (Acari: Tetranychidae)

The acaricidal potential of Melia azedarach, Peganum harmala, Nigella sativa and Trigonella foenum-graecum seeds was investigated on adult Tetranychus urticae under laboratory conditions. After the treatment of foliar discs using dichloromethane and ethanol extracts of these seeds, the statistical a...

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Bibliographic Details
Published in:African journal of agricultural research 2013-06, Vol.8 (23), p.2970-2976
Main Authors: Elkertati, Mustapha, Blenzar, Abdelali, Jotei, Abdelmalek Boutaleb, Belkoura, Ilham, Tazi, Bouchra
Format: Article
Language:English
Subjects:
Biotechnology
Insecticides
Insects
Plant biology
Science and Technology
Toxicity
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Summary:The acaricidal potential of Melia azedarach, Peganum harmala, Nigella sativa and Trigonella foenum-graecum seeds was investigated on adult Tetranychus urticae under laboratory conditions. After the treatment of foliar discs using dichloromethane and ethanol extracts of these seeds, the statistical analysis of the mortality percentage revealed that N. sativa was the most potent one. In fact, using the dichloromethane extracts, the LC50s were 398.64, 410.48, 73.95 and 520.74 ppm for the four species respectively. Whereas, for ethanol extracts, the LC50s were 994.93, 617.26, 92.96 and 1074.81 ppm respectively. n-Hexane, trichloromethane and ethyl acetate fractions of N. sativa dichloromethane extract used in the same manner showed that n-Hexane fraction was the most toxic with LC50=74.34 ppm followed by trichloromethane fraction with 96.74 ppm then ethyl acetate with 104.27 ppm. The phytochemical analysis of these fractions revealed the presence of some metabolites which could explain their toxicity. [PUBLICATION ABSTRACT]
ISSN:1991-637X