NON PREFERENCE/ANTIXENOSIS MECHANISM TO BROWN PLANT HOPPER (Nilaparvata lugens Stall) IN SELECTED RICE ENTRIES

Abstract

Non preference/ Antixenosis mechanism of resistance to brown planthopper, Nilaparvata lugens were studied in selected resistant, moderately resistant and moderately susceptible NSN-2 entries along with TN1 as susceptible check and Ptb 33 as resistant check. The Resistant entry, IET No. 23620 and moderately resistant entry, IET No. 23665 were exhibited less number of BPH nymphs settled per plant (1.3 nymphs/ plant). Resistant entries like IET No. 23739, IET No. 23620 and IET No. 23660, received more number of probing marks ranging between 22.3–30.8, excretion of less amount of honeydew (26.3- 46.3 mm2) and exhibited low fecundity (22.0-53.0 eggs/ pair), indicating the non-suitability of the entries for feeding and oviposition by brown planthopper which is a positive factor in including resistance to BPH in rice cultivars.