International network for natural sciences – research journal
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Mortality response of wheat aphid (Rhopalosiphum padi) against most commonly used insecticides in Pakistan

By: Muhammad Saleem Khan, Naureen Aziz Quershi, Muhammad Usman Khan, Farhat Jabeen, Muhammad Shakeel, Ali Umar, Muhammad Saleem Asghar

Key Words: Wheat, Aphid, Insecticide, Mortality, Response.

Int. J. Biosci. 8(2), 1-8, February 2016.



Rhopalosiphum padi is one of the most common wheat inhabiting pest and reduce the crop yield up to `15%. This pest species was collected from the wheat fields located in the vicinity of Faisalabad. The mortality response of said pest was find out in the different insecticides by standard nymphal dip method. The results showed that LC50 values of 9 tested insecticides against R. padi are statically different (5% probability level) and varied from 1.33±0.52 ppm for Imidacloprid to119.17± 16.55 ppm for Charphyrifos. Imidacloprid which caused 100% mortality at 64, 32 and 16 ppm more than 80% mortality at 8, 4 and 2 ppm was proved to be the most toxic insecticide against the R. padi. The Charphyrifos was least toxic as it caused only 41.53±3.21% mortality even at highest concentration. This study recommended the minimum dose recommendation in ppm for controlling this damaging insect. This study could be used as a reference for resistance monitoring or other related researches.


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