Anita Sable1, S. Suresh and S. Mohan Kumar
Abstract
Antibiosis of five selected genotypes against brown planthopper (BPH) Nilaparvata lugens was studied under glass house conditions. Number of probing marks by BPH was higher and feeding rate and adult longevity was lower on all test genotypes as compared to susceptible check TN1. BPH produced highest number of probing marks on RP 2068-18-3-5 (27.88/plant). Feeding rate of BPH females was measured by honeydew excretion area over 24 hours. On test genotypes, feeding rate ranged from 58.13 to 277.50 mm2 and 22.63 to 178.88 mm2 on 40 and 60 day old plants respectively which were significantly lower than TN1. Longevity of adults was significantly lower ranging from 4.05 to 7.12 days on all genotypes compared to 9.69 days on TN1. Plant resistance appeared to be increasing with increasing age irrespective of resistance level.