Abstract
In the present investigation, chromosome account of five species of aphids infesting Eleusine coracana (ragi) in hills of Shimla, Himachal Pradesh, India has been studied. These aphid species are a cause of great losses for the ragi crop which contributes significantly to the diet of hilly people. Aphid species studied are Brachycaudus helichrysi, Hysteroneura setariae, Rhopalosiphum maidis, Rhopalosiphum padi and Tetraneura nigriabdominalis. Karyotypes were prepared from the well spread metaphase plates. Diploid number was found to be 2n = 12 in B. helichrysi and H. setariae, 2n = 8,10 in R. maidis, 2n = 8 in R. padi and 2n = 18 in T. nigriabdominalis. The actual length and total complement length data was used to calculate the relative length of chromosomes and to construct the idiograms. Based on relative lengths of chromosome and idiograms, we find significant species specific diagnostic differences in the length of shortest chromosomes of T. nigriabdominalis and Rhopalosiphum species.
Published Version
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