Toxicity of Imidacloprid 17.8%SL and Triflumezopyrim 10%SC to Rice Brown Planthopper Nilaparvata lugens Priyadharshini E, Muthukrishnan N*, Vinothkumar B, Sathiah N1, Prabakar K1 Department of Agricultural Entomology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore641003, Tamil Nadu, India Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore641003, Tamil Nadu, India *Email: nmkrish@tnau.ac.in (corresponding author)
Online Published on 04 January, 2024. Abstract The rice brown planthopper Nilaparvata lugens (Stål.) is a threat to rice growers and it has developed resistance to many insecticides. Hence, newer molecules like triflumezopyrim 10%SC are available. Its toxicity has been investigated in this study, with four populations from Tamil Nadu along with imidacloprid 17.8%SL using rice seedling dip method. Lower LC50 values of 0.538 ppm and 0.280 ppm were observed with the susceptible populations against imidacloprid 17.8%SL and triflumezopyrim 10%SC, respectively. LC50 values were in range of 0.280-0.848 ppm for triflumezopyrim 10%SC indicating its superior toxicity. Nagapattinam population exhibited moderate resistance (15.36 folds) to imidacloprid 17.8%SL and low resistance (3.02 folds) to triflumezopyrim 10%SC. Top Keywords Nilaparvata lugens, Rice, Triflumezopyrim 10%SC, Imidacloprid 17.8%SL insecticide resistance, Susceptibility, Bioassay, Seedling dip method, Resistance ratio. Top |