The present study aimed to investigate the effect of altering host plant on the mortality, Fitness and growth rate of the generalist and specialist aphids. 1.There was a significant increase in mortality of generalist aphids on Z. mays but low mortality on V. fabae. Mortality of specialist aphids was significantly low among V. fabae host plant and C. acutum. 2.The generalist aphids showed the highest fitness, growth rate and performance on V. fabae whereas specialist aphids showed lower fitness, growth rate and performance on V. fabae than on C. acutum. The generalist aphids took...