Impact of λ-Cyhalothrin on Carbohydrate Metabolizing Enzymes and Macromolecules of a Stored Grain Pest, Trogoderma granarium
Impact of λ-Cyhalothrin on Carbohydrate Metabolizing Enzymes and Macromolecules of a Stored Grain Pest, Trogoderma granarium
Farah Rauf Shakoori1,*, Anum Feroz1, Ayesha Gondal1,Sahar Akram2 and Tanzeela Riaz3
ABSTRACT
The present study was aimed to evaluate the biochemical effects of λ-cyhalothrin on carbohydrate metabolism and macromolecular concentrations of 4th and 6th instar larvae of a stored product pest, Trogoderma granarium. The LC50 values of λ-cyhalothrin for 4th and 6th instar larvae of Lahore population was 15.93 and 13.76ppm respectively, while 19.07 and 16.21ppm were for the 4th and 6th instar larvae of Gujranwala population, respectively. The resistance ratio RR (0.67 and 1.17) for 4th and 6th instar larvae, respectively, indicated very little or no tolerance in T. granarium against λ-cyhalothrin in the godowns. The sub lethal dose of λ-cyhalothrin (LC20) significantly increased the contents of free amino acids and soluble proteins while contents of total proteins, lipids, glycogen and trehalose were significantly reduced with reference to their control (untreated group). Among carbohydrate metabolizing enzymes, the activities of amylase and invertase were significantly reduced while activity of trehalase were significantly increased after treatment with sub lethal dose of λ-cyhalothrin as compared to control. The metabolic derangements induced by sub-lethal dose of λ-cyhalothrin suggest that infestation caused by T. granarium in godowns could be overcome by calculating lethal dose of λ-cyhalothrin.
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August 2018
Vol. 50, Iss. 4, Pages 1199-1600
