تغييرات جمعيت شته ي صنوبر CHAITOPHORUS POPULETI )HOM: DREPANOSIPHIDE(

Chaitophorus populeti (Panzer) is considered as an important pest of Populus alba in the Chaharmahal-Bakhtiari province. During 2000-2001, the population fluctuation of the aphid and its predators was studied in four different regions including Juneghan, Zayandeh-Rood, Baba-Heidar and Cheshmeh-Ali. Population sampling was carried out weekly in these regions by cutting four branches (length 30 cm) from four trees considering the four main geographical directions. Then the aphids and natural enemies in each branch were counted. The results indicated that the peak of aphid populations