بررسی حساسیت گونه ها و کلن های صنوبر(Populus spp.) به دو آفت مهم صنوبر در استان همدان

Monsteira unicostata (Mulsant & Rey.) and Melanophila picta Pall. are important pests of Poplar and willow trees in Hamadan province. During the years 2011-2010, the level of infestation of these pests was evaluated on 11 native and non-native poplar colonies were planted in the field of Hamadan Agricultural and Natural Resources Research Center. poplar clones belonging to Populus alba, P. nigra, P. deltoides and P. x. euramericana were evaluated in a randomized complete block design with three replications. From stands planted in the middle of each plot, five trees were randomly chosen, In M. unicostata survey, sampling by choosing 4 leaves of the same size from the four main directions and at distance of 150-200 cm in the tree crown was done in July and August. In M. picta survey, height range of 10-110 cm of the main trunk of the trees was covered with a fine net and the number of insects under the net was counted, Counting was done weekly from June until August. The statistical data were analyzed by SPSS 16.0 software. The results showed, A significant difference in infection rate was found between clones. Mean comparison with Duncken’s test showed that Colonies of P. d. missoriensis, P. x. euramericana 214, P. nigra 2/75 and P. nigra 167/62 had the highest and lowest number of M. picta insects escaped from the trunk of Poplar trees, respectively. The colonies of P. alba 58/57 and P. nigra 62/140 had the highest and lowest numbers of M. unicostata eggs in the leaves of colonies, respectively. Based on this study, P. nigra 62/140, P. nigra 62/167, and P. nigra 1/74 clones with the highest adaptability and performance had higher relative resistance to these two important Poplar pests.