Vol. 12, Special Issue 9 (2023)

Author(s):
P Kranthi, V Jhansi Lakskmi, DK Rana, SK Mangrauthia, S Deole, SB Verulkar and RR Saxena

Abstract:
The resistance reaction of ten selected rice genotypes to both the brown planthopper (BPH) Nilaparvata lugens (Stål) and whitebacked planthopper (WBPH) Sogatella furcifera (Horvath) were assessed by mass screening technique. PTB-33 exhibited high resistance (0.8), while RPBio4918-230-S (DS-1.2), BM71 (DS-1.6), and RP2068-18-3-5 (DS-1.9) were resistant. MO1 (DS-5.7), N’Diang Marie (DS-6.2), N22 (DS-7.6), Swarna (DS-9.0), BPT5204 (DS-9.0) and TN1 (DS-9.0) were susceptible. MO1 (1.8), N’Diang Marie (2.0) and N22 (2.6) were resistant to whitebacked planthopper. PTB33 exhibited moderate resistance (DS-4.2) whereas RPBio4918-230-S (DS-5.8), BM-71 (DS-5.6), RP2068-18-3-5 (DS-5.8), Swarna (DS-9.0), BPT5204 (DS-9.0) and TN1 (DS-9.0) were susceptible to WBPH. The settling behaviour of both BPH and WBPH nymphs on the genotypes correlated with the resistance scores. BPH nymphs settled on different genotypes ranged from 5.2% to 19.0%, with TN1 displaying the highest (19.0% nymphs) and PTB33 having the lowest (5.2% nymphs) settling rates. WBPH nymphs settled on different genotypes varied from 4.3 (N22) to 18.3% (TN1) based on the resistance levels. This study underscores genotype-specific responses to planthopper species, with damage scores and settling behaviours as informative indicators of resistance.