Probing Behaviour of Brown Planthopper Nilaparvata lugens (Stal.) in the Resistant Germplasm Accessions

A total of 1110 ENRRD rice germplasm accessions were evaluated for their resistance to brown planthopper, BPH in glass house by adopting internationally accepted standard seed box screening technique and scored on 0-9 scale by following the IRRI method of standard evaluation system for rice. Among 1110 rice germplasm accessions tested, 3 were categorized as Highly resistant, 24 as resistant, 19 as moderately resistant, 192 as moderately susceptible, 509 as susceptible and rest of other 363 genotypes were highly susceptible to BPH. The studies on antixenosis mechanism of resistance for feeding by probing marks revealed that resistant entries, were least preferred by BPH nymphs and adults with more number of probing marks The results indicate that the germplasm accessions viz., IC 343457, IC 300168 and IC 377051 were highly resistant and possess non- preference mechanism of resistance and are not preferred by BPH for feeding. The identified resistant entries can be used in the breeding programmes to develop BPH resistant varieties.