Chromosomal Studies on Aphids Infesting Cereals from Himachal Pradesh, India

Abstract

The present study investigated aphids’ chromosomes infesting cereal crops from Mandi District, Himachal Pradesh. The chromosomes in aphids were holocentric and had equally distributed kinetic energy along the entire length. The aphids were collected from cereals belonging to Poaceae family. These aphid species Metopolophiumdirhodum (Walker, 1849), Rhopalosiphummaidis (Fitch, 1856) and Sitobionbrevirostre (Heikenheimo, 1978) were found infesting Hordeumvulgare, Zea maize and Triticumaestivum respectively. The diploid chromosome number in these species was2n=8 and 18. The idiograms were constructed based on relative length data.