Prevalence of neonicotinoid resistance in cotton aphid Aphis gossypii (Glover) Bose A Subash Chandra3,,*, Murugan M1, Shanthi M, Ramalingam J2, Mini M L2 3Department of Agricultural Entomology, Agricultural College & Research Institute, Tamil Nadu Agricultural University (TNAU), Madurai, 625104 1Department of Agricultural Entomology, TNAU, Coimbatore, 641003 2Department of Biotechnology, Agricultural College and Research Institute, TNAU, Madurai, 625104 *Email: parthasuvi@gmail.com (corresponding author)
Online published on 18 April, 2020. Abstract Bioassays were conducted with neonicotinoids viz., acetamiprid, clothianidin, dinotefuran, imidacloprid, thiacloprid and thiamethoxam on field populations of cotton aphids collected from ten locations of Tamil Nadu. Perambalur population was found to be resistant to all six neonicotinoids with LC50 values of 0.884, 1.718, 1.535 and 0.521 ppm for acetamiprid, imidacloprid, thiamethoxam and thiacloprid, respectively. Aphids from all the locations showed resistance to thiamethoxam with LC50 values in range of 0.034 to 2.184 ppm. No resistance to clothianidin and dinotefuran was found with resistant ratios of 3.00 and 4.56-folds. Hence, clothianidin and dinotefuran could be promoted against aphids in rotation to sustain their efficacy. Top Keywords Neonicotinoids, acetamiprid, imidacloprid, thiamethoxam, thiacloprid, clothianidin, dinotefuran, Aphis gossypii, leaf-dip bioassay, LC50. Top |