RESISTANCE TO INSECTICIDES IN DIFFERENT FIELDS POPULATION OF COTTON APHID, Aphis gossypii Glover

N.A. RUDANI¹, R.D. PATEL²*, G.R. BHANDERI³, H.R. DESAI^4
1Main Cotton Research Station, Surat, 395007, Navsari Agricultural University, Navsari, 396450, Gujarat, India
²Main Cotton Research Station, Surat, 395007, Navsari Agricultural University, Navsari, 396450, Gujarat, India
³Main Cotton Research Station, Surat, 395007, Navsari Agricultural University, Navsari, 396450, Gujarat, India
⁴Main Cotton Research Station, Surat, 395007, Navsari Agricultural University, Navsari, 396450, Gujarat, India
* Corresponding Author : rdpatel@nau.in

Received : 05-11-2022     Accepted : 27-11-2022     Published : 30-11-2022
Volume : 14     Issue : 11       Pages : 11868 - 11871
Int J Agr Sci 14.11 (2022):11868-11871

Keywords : Aphid, Aphis gossypii, Bioassay, Cotton, Resistance, Insecticides
Academic Editor : Dr Prashant Shrivastava, Seema Rani
Conflict of Interest : None declared
Acknowledgements/Funding : Authors are thankful to Main Cotton Research Station, Surat, 395007, Navsari Agricultural University, Navsari, 396450, Gujarat, India
Author Contribution : All authors equally contributed

The resistance to insecticides was assayed for field populations of cotton aphid collected from Bharuch district, Gujarat by leaf dip bio-assay at Main Cotton Research Station, Navsari Agricultural University, Surat during 2019-20. The result indicated that LC50 values for acetamiprid 20 SP, thiamethoxam 25 WG, flonicamid 50 WG, imidacloprid 17.8 SL and profenofos 50 EC ranged from 0.001 to 0.003, 0.002 to 0.003, 0.003 to 0.005, 0.002 to 0.005 and 0.025 to 0.049 per cent and LC90 values ranged from 0.009 to 0.025, 0.008 to 0.017, 0.015 to 0.023, 0.009 to 0.045 and 0.089 to 0.247 per cent, across the locations respectively. The two insecticides tested viz., acetamiprid 20 SP and imidacloprid 17.8 SL were less toxic to across all locations to aphid recording higher LC50 and LC90 values. The relative toxicity among the insecticides revealed that flonicamid 50 WG, profenofos 50 EC and thiamethoxam 25 WG were highly toxic to aphid population across the locations showed that resistance to these insecticides not much developed against aphid. Jambusar populations were more susceptible to tested insecticides as compared to other locations. The comparison between the LC90 values obtained with field recommended rate showed the lowest relative resistance ratio for flonicamid (1.00 to 1.53- fold), profenofos (0.89 to 2.47- fold) and thiamethoxam (1.60 to 3.40- fold) whereas higher ratios for imidacloprid (2.02 to 10.11- fold) and acetamiprid (4.50 to 12.50- fold). There was large variation between the LC90 and recommended rate of imidacloprid 17.8 SL and acetamiprid 20 SP across locations showing evolving of low to moderate resistance in aphid population