Morphological studies on Aphid Fauna of Haryana as a tool for identification of different species

The results demonstrated that variation do exist within aphid population. Myzus persicae had the shortest body length 0.537 mm followed by Rhopalosiphum maidis (2.56 mm) and Lipaphis erysimi (2.77 mm) and Sitobion avenae (2.75 mm) exhibited almost equal/overlapping body length. with regards to relative length of antennal segment III to the processus terminalis (ant. III/PT) L. erysimi had the greatest length 0.968 mm followed by R. maidis (0.91 mm) and S. avenae (0.85 mm). R. maidis had the greatest relative length of siphunculus to hind femur (0.59 mm) followed by L. erysimi (0.56 mm) and S. avenae (0.55 mm). However L. erysimi and S. avenae differed by only 0.01 mm.