Evaluation of core rice germplasm accessions for resistance to brown planthopper (Nilaparvata lugens Stal) at seedling stage

Abstract

Brown planthopper, Nilaparvata lugens is the major pest in rice production. Development of BPH- resistant varieties is an economical and effective way to control this pest. In present investigation 600 rice genotypes were screened in greenhouse along with resistant and susceptible checks viz., PTB 33 and TN1 respectively during Kharif 2016, Rabi-Summer 2017 and Kharif 2017 results were confirmed by probing mark test by BPH. Among the rice genotypes which showed the resistance to BPH were also studied for BPH honeydew excretion as indicator of antibiosis mechanism. Among the 600 genotypes five is shown resistant namely IC454040, IC454223, IC135425, IC301734 and IC301736. The selected resistance genotypes also exhibited significantly highest probing marks with resistant, IC454040 recorded lowest honeydew excreted area of 16.23mm2/2(♀) and followed by IC 454377, IC 301732, IC 301736, IC 460174X, IC 459199, and PTB 33 registered significantly lower honeydew excretion (17.22, 18.76, 19.49, 19.57 and 20.07 mm2 / 2 (♀) respectively). The rice genotype which has shown resistant to BPH can be used in breeding programmes for developing the BPH resistant varieties.