Abstract: Study on the influence of environmental factor on rose aphid(Macrosiphum rosaeiformis Das (Homopetra:Aphididae) was conducted in the campus lawns of University of Aarid Agriculture Rawalpindi. The aphid population was found from March to May and peaked in the 2nd week of April, 2000. The greater aphid densities were recorded on the top portion of plant. High temperature (over 30 °C) associated with relative humidity, rainfall and windstorm substantially reduced the number if aphids on rose. Deformation of stems, leaves and flowers resulted in case of strong infestation by the aphid.