iarjalsIARJALSIARJALS2708-5104https://doi.org/10.47310/iarjals.2021.v02i02.008Species Composition and Relative Abundance of Aphids on Wheat (Triticuma Estivum) in the Agro-Ecology of Pusa, BiharRaniKumariVijayKumarThakurRaghunathPrasadSinhaDepartment of Zoology, C. M. Science College, Lalit Narayan Mithila University, Darbhanga, Bihar, 846008, IndiaCereal aphid species are becoming one of the significant pests of wheat under the vagaries of agro-climatic conditions of Bihar in the regime of global warming. No scientific study seems to exist on species complex of aphids affecting the wheat crop in the region. Present investigation aimed to resolve the prevailing species complex of the crop. The observations were recorded on eleven diverse wheat genotypes planted in randomized block design during 2012-13 and 2013-14 under unprotected field condition. Aphid population was found maximum during 1st to 2nd weeks of March when the crops were mostly between 58 to 69 Zadoks growth stages.  The level of infestation varied from 5% to 100%. In most of the plants the aphids were mainly concentrating on the ear head. Among the wheat genotypes used for the investigation the ear heads were mainly infested by the mixed population of grain aphids i.e. Sitobion avenae (Fabricius) and S. miscanthi, dominated by S. avenae. The aphid intensity varied from less than 10 per tiller to more than 50 per tiller. Other two species which were present in relatively low proportion were Rhopalosiphum maidis and R. padi. R. maidis observed mainly on flag and few lower leaves whereas the R. padi wasobserved on leaves and ear heads often with few numbers. Aphid complex comprising of these four species was found in all the years of investigation with fluctuation in their relative proportions in which grain aphids were found most predominant.