الفهرس 
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Abstract
the experiments were carried out at the farm of center research belonging to faculty of agriculture, mansoura university to survery the primary aphid parasitiods associted with five aphid specias namely : aphis craccivora, brevicoryne brassicea, sitobion avenae, rhopalospiphum maidis and rhopalosiphum padi on five host plants to study the population density of the aphid.