تغييرات فصلي جمعيت شته سبز هلو Myzus persicae(Sulz) (Hom:Aphididae) و زنبور پارازيتوئيد آن Aphidius matricariae بر روي سيب زميني در مناطق بهبهان و ياسوج

Seasonal Population Fluctuation of Myzus persicae (Hom: Apbididae) and its Parasitoid Aphidius matricariae (Hymenoptera: Braconidae) on Potato in Bebbaban and Yassuj Regions

Aphids of potato plants in Yassuj (cold Region) and Behbahan (hot region) were collected weekly and the seasonal fluctuation of Myzus persicae and its natural enemy, Aphidius matricariae (Hymenoptera:Braconidae) were studied during 2001 and 2002. Migration of this aphid was also studied by using yellow traps in cities of Dogonbedan, Deal and Dehdashat at the locations between Behbahan and Yassuj. In Behbahan region the peak of the population was observed from the end of March to the end of April for wiche then decreased shrply. In Yassuj, two peaks of the population were observed in June and September. Population of M persicae and its parasitoid A. matricariae were almost synchronously increased. This pest does not lay eggs in Behbahan region and it was not observed on their shelters and yellow traps of this region during July and September (hot season). However, it was observed at the locations between Behbahan and Yassuj in November. From these data and observations, the possibility of the annual aphid migration from Yassuj to Behbahan has been discussed.