Abstract

                                Of 15 planthopper resistant varieties evaluated for resistance to Sogatella furcifera, nine had high levels of resistance. Among the IR varieties, IR 36 and IR 56 had field resistance to Sfurcifera as indicated by their susceptibility in the standard seedbox test and resistance as older plants in the modified seedbox test. Insect growth and development, food intake, longevity and egg hatchability differed significantly among varieties of the same age and at different plant ages within the same variety. Population increase on resistant varieties was low at the two plant ages tested.

Key words : Whitebacked planthopper. Sogatella furcifera; Mechanisms of resistance. Plant resistance to insects