Role of physio-morphic characters of different genotypes of eggplant,solanum melongena L. and its association with the fluctuation of jassid,amrasca biguttula biguttula (Ishida) population

The experiment was conducted on different brinjal genotypes to find out the impact of physiomorphic plant characters on the jassid fluctuation. the seedlings of the six brinjal varieties i.e.,purple long f1,oval round white f1,virb-02-f1,round black,long shape white f1 and dil nasheen were sown by keeping the plot size 9 m × 12 m on 24 june 2013. all the recommended agronomic practices were applied without using any plant protection measures for the control of pest population. the data regarding the population of jassid was taken randomly from fifteen leaves of fifteen plants/treatment/replication in such a way that each variety in each replication was selected and tagged. the different physio-morphic plant characters were recorded at the crop maturity. the maximum variations were observed among the resistance and susceptible brinjal genotypes due to plant height,hair density,number of primary branches and length of hair and moisture percentage. the effects of plant characters of brinjal were correlated with the population of jassids and calculated their impact by processing the data into simple and multiple linear regression equation. the hair density on the lamina showed the maximum impact (52.1%) for the population fluctuation of jassid. the number of primary branches and height of plants showed the minimum impact on jassid. the hair density and length of hair on the lamina and veins showed a highly significant negative correlation with the jassids population while midrib hair density showed the negative and non significant effects,but by the simple linear equation the moisture percentage,plant height and number of primary branches showed non significant and positive correlation. © copyright 2016 zoological society of pakistan.