Detection of Resistance in Lab and Field Collected Strains of Two Major Pests of Stored Grains against Deltamethrin and Phosphine
Detection of Resistance in Lab and Field Collected Strains of Two Major Pests of Stored Grains against Deltamethrin and Phosphine
Asim Munawar1,2*, Farooq Ahmad1, Aqsa Arshad1, Muhammad Ishaque Mastoi3 and Chengjuan Liang4
ABSTRACT
The lesser grain borer, Rhyzopertha dominica and red flour beetle, Tribolium castaneum are considered most destructive pests of storages commodities worldwide. Unfortunately, due to multiple applications of synthetic pyrethroids and fumigants some major pests of stored grains has develops resistance against them. Resistance mechanisms in R. dominica and T. castaneum against these control agents at different geographical locations was largely unknown. To overcome this gap our research was undertaken to evaluate the resistance mechanism in lab and field collected strains of R. dominica and T. castaneum against deltamethrin and phosphine. Results indicated significant difference between lab and field collected pests strains regarding their resistance mechanisms to deltamethrin as well as phosphine treatments. Field strains collected from various geographical locations were observed more resistant then lab strains. Calculated LC50 values was very less in field strains as compared to lab strains. Maximum mortality of lab and field collected strains of R. dominica and T. castaneum was observed against phosphine than against deltamethrin. Our results suggest that field strains experienced with different out door conditions was less susceptible as compared to lab strains which proved to be more susceptible and findings of this study could be helpful for effective management of these key pests keeping in mind the issue of resistance development.
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