عنوان مقاله [English]
نویسندگان [English]چکیده [English]
The elm aphid, Tinocallis nevskyi (Hemiptera: Aphididae) is an important pest of elm trees in Shahrekord. In addition to direct damage through feeding and reducing plant vigor, the aphid excretes considerable amounts of honeydew, creating a nuisance, especially in recreational areas. Considering growing concerns about using chemical pesticides in urban areas, it is necessary to apply other pest control tactics such as biological control. In order to collect natural enemies of the aphid and determine their seasonal fluctuations, weekly samplings were performed during 2002-2003. Seasonal population fluctuations of the aphid and its natural enemies were also compared. Identified natural enemies were as follow: Trioxys pallidus as a hymenopteran parasitoid, Erythraeus (Erythraeus) hypertrichotus as a parasititic mite, 12 ladybird species from nine genus(Clitostethus, Stethorus, Hippodamia, Oenopia, Chilocorus, Exochomus, Adalia, Coccinella, Scymnus), five dipteran species from Chamaemyiidae and Syrphidae and five hemipteran species from Miridae, Antocoridae and Lygaeidae as predators. The total predator population peak nearly coincided with that of the aphid, but there was no synchrony between seasonal fluctuations of the aphid and its parasitoid.