Evaluation of susceptibility of species and poplar clones to Pemphigus spyrothecae, Pemphigus vesicarius , Pemphigus borealis and Camarotoscena fulgidipennis in Hamadan Province Iran

Gall-inducing species Pemphigus spyrothecae, P. vesicarius , P. borealis and Camarotoscena fulgidipennis were considered as an important sucking pest of poplars in Hamadan province and Iran. In this study that was carried out during 2010-2011, its density on 15 native and exotic poplar clones belonging to Populus alba, P. nigra, P. deltoides and P. x. euramericana were evaluated in a randomized complete block design with 3 replications. From stands planted in the middle of each plot, 5 were randomly chosen, then 4 branch in 100-200 cm height was selected in each geographical direction and number of galls on it were counted. The clones of P. alba, P. deltoides and P. x. euramericana haven't gall and completely resistant and these infestation was observed in P. nigra clones. The statistical data were analyzed by SPSS 16.0 software. A significant difference in infection rate was found between clones. Mean comparison with Duncken’s test showed that highest number galls of P. spyrothecae, P. vesicarius, P. borealis and C. fulgidipennis were observed in 6, 1, 1 and 1 clones and lowest number galls weer observed in 4, 5, 6 and 3 clones repectevely. By these results, Clones of P. nigra 49/5, P. nigra 62/167, P. nigra 62/172, P. alba 58/57, P. deltoides missoriensis and P. x. euramericana 214 had the highest yield in wood production and were resistant to the these pests.