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Wheat (Triticum aestivum L.) is one of the major source of food worldwide. However, it suffers from numerous constraints. The aphids, particularly Rhopalosiphum padi (Linnaeus) and Sitobion avenae (Fabricius) species are among the major causes that severly affect wheat production acrossthe globe. To determine the population dynamics of aphids associated with wheat crop in Khyber Pakhtunkhwa, we examined the mean population of both species in the selected areas (Maho Dheri, Sarband, Kandare, Rag Narai and Khazana Dheri) of district Mardan in 2015. The mean population of R. padi and S. avenae per plant were recorded every week by counting the number of aphids on 5 plants picked up randomly from each selected wheat field using the diagonal methods. The results on current study showed that the infestation of both aphid species was started in the 1st week of February (05 standard weeks). The densities of aphids per plant increased as the vegetative growth proceeded and was highest till the mid of March (10th and 11th standard week). The declined in aphid populations for both species were started after mid of March and ended in April. The mean population of both aphid species was found low in the 1st week of February (05th standard week) that is probably due to the low temperature. The population density of aphids reached to the its peak in the second week of March due to suitable temperature for aphid infestation.
Keywords: District Mardan; Population dynamics; Rhopalosiphum padi; Sitobion avenae and Wheat