2018 Volume 5 Issue 4

Possible Chitin Inhibitor Effects of Melilotus Indicus (L.) Extraction on Spodoptera Littoralis (Boisduval) Under Laboratory Conditions

Mohamed Ahmed Ibrahim Ahmed, Ahmed Mahmoud Mohamed Ahmed, Mohamed Abdel-Rahman Mohamed Amro

Yellow sweet-clover, Melilotus indicus (L.), is known for its medicinal and ethnomedicinal uses.  A very few studies have focused on the efficacy of it on pest control. Herein, the biological effects of sublethal concentrations of M. indicus extract in comparison with three insect growth regulators (IGRs), novaluron, lufenuron, and diflubenzuron against the life cycle of Spodoptera littoralis (Boisd.) were evaluated under laboratory conditions. All tested compounds, especially M. indicus, prolonged the duration of the larval and pupal stages comparing to that of the untreated control.  The emerged adult percentage was highly reduced by 91.35%, 78.96%, 77.33%, and 62.46% after larval feeding with the higher concentration of M. indicus extract, diflubenzuron, novaluron, and lufenuron; respectively. M. indicus extract and diflubenzuron caused high increment in malformation in larvae, pupa, and adults. The efforts should be implemented to get better understanding about the molecular basis of its possible unknown mode of action on growth hormones to be continued in the future.


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