Antibiosis Studies on okra genotypes against Amrasca biguttula biguttula (Ishida).

Abstract

The antibiosis studies on selected genotypes of Okra against jassid were conducted under semi natural conditions. The data on antibiosis (mating period, number of nymphs emerged, nymphal period, number of nymphs reaching to adult stage and survival of nymphs (%), antixenosis (preference/non preference) and tolerance studies based on fruit yield per plant were conducted. The genotype Pusa Swani showed highest mating period (19.67 minutes), number of nymphs emerged (19.33 per female), number of nymphs reaching to adult stage (17.67), nymphal survival (91.36%) and the lowest nymphal period (7.33 days) proved to be comparatively susceptible and the genotype Sanum was found to be comparatively resistant which showed mating period of 11.67 minute, number of nymphs emerged per female 8.00 per female, nymphal period 10.67 days, number of nymphs reaching to adult stage 3.33 and nymphal survival of 41.66%. Lower trend of jassid after feeding on genotype, Sanum observed individuals in the range of 2.67 per plant whereas, Pusa Swani was found to be the most preferred having 9.67 individual per plant. Tolerance study revealed that Sanum resulted in the highest fruit yield (148.73 g/plant) and was statistically at par with those of recorded on Sanum (145.13 g/plant) and Okra-7080 (143.74 g/plant). The genotype Pusa Swani resulted in minimum yield i.e. 112.92 g/plant.