Comparison of antibiosis resistance of 21 clones of Populus spp. to woolly poplar aphid

Subject Areas : entomology and othea arthropods

Z.  Rafiei-Karahroodi ¹ (Entomology Department, Agricultural faculty, Islamic Azad University, Arak, Iran)
E.  Sadeghi ² (Institute of Forest and Rangeland of Iran, Tehran)
Z.  Azdoo ³ (Agricultural and Natural Resources Research Center of Arak, Arak)
G.  Goodarzi ⁴ (Agricultural and Natural Resources Research Center of Arak, Arak)

Received: 2009-07-29 Accepted : 2011-02-10 Published : 2011-05-22

Keywords:

Abstract :

The woolly poplar aphid (Phloeomyzus passerinii Sign.) is one of the most important sucking pests of poplars in Iran and Markazi province. In this study, antibiosis resistances has been studied in twenty one clones belonging to two species include Populus alba L. and Populus nigra L. Tests were carried out in controlled condition of 60-70%RH, 25-30˚C and 16:8 L: D photoperiods. The length and diameter of poplar cuts were 20 and 1-1.5 centimeter, respectively. Following establishment of new born nymphes on the cuts, were allowed them to reach mature stage. After that, number of first nymphale instars deposited and nymphale mortality rate on each tested cut were recorded daily and along the lifecycle period. Antibiosis test showed P. alba, P. nigra betuli and P. nigra 63.135 observed without any aphid natality, and most rm was observed on P. nigra 56.52, P. nigra 72.14, P. nigra 72.18, P. nigra 47.40 and P. nigra 49.5 with 0.594, 0.580, 0.503, 0.474 and 0.441 and the  least rm was observed on P. nigra 56.75, P. nigra 72.5, P. nigra 72.4, P. nigra 56.21, P. nigra 56.53 and P. nigra 56.72 with 0.297, 0.279, 0.249, 0.216, 0.207 and 0.134, respectively, that showed antibiosis resistance of this clones to this aphid. All P.alba clones and P. nigra63.135 and P. nigra betuli were compeletely resistance to woolly poplar aphid and aphids had no natality on this clones.