Indian Journal of Agricultural Research

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Research Article

Indian Journal of Agricultural Research, volume 53 issue 4 (august 2019) : 453-457

Insecticide resistance studies of Cypermenthrin 25EC and Chlorpyriphos 20EC against Spodoptera litura fabricius, 1775 (Lepidoptera: Noctuidae) 

Rupa Sule, Dolly Kumar
1Department of Zoology, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara-390 002 Gujarat, India.
Cite article:- Sule Rupa, Kumar Dolly (2019). Insecticide resistance studies of Cypermenthrin 25EC and Chlorpyriphos 20EC against Spodoptera litura fabricius, 1775 (Lepidoptera: Noctuidae). Indian Journal of Agricultural Research. 53(4): 453-457. doi: 10.18805/IJARe.A-5260.

ABSTRACT

Spodoptera litura is one of the important pests and causes considerable damage to the crop. The indiscriminate use of insecticides result in development of resistance. Hence experiments were planned in laboratory conditions. The pest was reared in laboratory for many generations without exposure to any insecticides during 2018-19. After ensuring infection free culture, the insecticide resistance monitoring assays were performed to determine the development of resistance against two insecticides Cypermethrin 25EC and Chlorpyriphos 20EC by leaf-dip methodology. It was performed for five subsequent generations. The experimental results indicate greater resistance developed in Cypermehtrin 25EC @ 0.5 ppm (LC 50: 0.49, LC 90: 0.94) as compared to Chlorpyriphos 20EC @ 0.05 ppm. (LC 50: 0.05, LC 90: 0.34). This shows that there is onset of resistance in Cypermethrin 25EC, which may cause adverse effects, if not used in proper rotation with other insecticides.

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