International Journal of Entomology Research

International Journal of Entomology Research


International Journal of Entomology Research
International Journal of Entomology Research
Vol. 2, Issue 4 (2017)

Insecticidal toxicity upto third trophic level: A case study of Cypermethrin and Bifenthrin


Haseeb Jan, Muhammad Naveed Akhtar, Muhammad Usman, Zunnu Raen Akhtar

In tritrophic interactions organisms are linked with one another through food chains and food webs. An experiment was conducted in laboratory to observe the toxicity of cypermethrin and bifenthrin at three different concentrations against first instar of cabbage lopper and its predator lady bird beetle as compared to control in tritrophic interaction. Cypermethrin and bifenthrin were observed for its toxicity at lower, recommended and higher doses against cabbage looper and its predator lady bird beetle using leaf dip method in tritrophic interaction. For cypermethrin, cabbage looper mortality tests at lower, recommended, and higher doses showed that after two hours of treatment mortality was 40%, 73.33%, 73.33% respectively, while for lady bird beetle 46%, 66.67, 73.33% respectively. After four hour mortality for cabbage looper was 60%, 99.87%, 100% respectively, while for lady bird beetle 53.33%, 66.67%, 86.67% respectively. After six hours of tratment mortality was 66.67% while at recommended and high dose was 100% for cabbage looper, while for lady bird beetle moratliry at low dose was 66.67% while at recommended and high doses were 73.33% and 100% respectively. For bifenthrin, cabbage looper mortality tests at lower, recommended and higher showed that after two hours of treatment mortality was 66.67%, 73.33%, 40%, while for lady bird beetle was 60%, 73.33%, 46.67% respectively. After four hour mortality for cabbage looper was 80%, 100%, 60%, while for lady bird beetle 60%, 73.33%, 46.67% respectively. After six hour of treatment, mortality at lower dose was 66.67% while at recommended and higher doses was 100% for cabbage looper. After six hour mortality at low dose was 66.67% while 73.33%, 100% at recommended and high doses. The results showed that cypermethrin caused toxicity to cabbage looper at lower, recommended, and higher doses as compared to bifenthrin and control, nonetheless it also revealed more toxic to predator lady bird beetles as compared to bifenthrin and control. So, as conclusion it can be affirmed that cypermethrin caused early toxicity to insects and also upto third trophic level as compared to bifenthrin which rendered harmless at third trophic level.
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