1Professor Jayashankar Telangana State Agricultural University, Rajendranagar, Hyderabad500030, Telangana, India
2ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad500030, Telangana, India
3Acharya N G Ranga Agricultural University, Lam, Guntur522034, Andhra Pradesh, India
*Email: yerramsridhar303@gmail.com (corresponding author)
Online Published on 17 December, 2025.
Cross-resistance pattern of imidacloprid resistance in brown planthopper, Nilaparvata lugens (Stål) to three insecticides viz., dinotefuran, pymetrozine and triflumezopyrim was evaluated with laboratory developed imidacloprid resistant (IMI-R) and susceptible populations (IMI-S). IMI-R population had a 6-fold resistance compared to IMI-S population. The LC50 values for dinotefuran in IMI-R and IMI-S populations were 466.6 and 129.2 mg/ L with a resistance ratio of 3.6-fold. Whereas, LC50 values for triflumezopyrim and pymetrozine in IMI-R and IMI-S populations were 0.27 and 0.17 mg/L; 49.07 and 31.5 mg/L with resistant ratios of 1.58 and 1.55, respectively. These findings clearly demonstrated cross-resistance between imidacloprid and dinotefuran but no obvious cross-resistance to triflumezopyrim and pymetrozine.
Rice, Insecticides, Neonicotenoids, Imidacloprid, Dinotefuran, Triflumezopyrim, Pymetrozine, Bioassay, LC50, Probit Analysis
