Investigating the resistance of 21 closed-crown poplar clones to pests and their quality status in the adaptation plan (comparative population) in Markazi province

Document Type : Scientific Letters

Authors

1 Assistant Prof., Research Division of Natural Resources, Markazi Agricultural and Natural Resources Research and Education Center, AREEO, Arak, Iran.

2 Assistant Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran.

10.22092/irn.2023.361817.1508

Abstract

In this research, 21 clones of closed-crown superior poplar were selected from among the clones studied in the first stage of the experiment (selection nursery) under the randomized complete blocks statistical design with three replications at 3 x 3 m—spacing for ten years. Clone No. 72 was collected from the Markazi province in 1993. Other clones were tested and planted in other regions of the country or abroad in 1997. During the growing seasons in different years, in addition to post-planting operations (irrigation, weeding, pruning), the percentage of resistance and sensitivity of different clones in five qualitative grades, including grade 5 (76-100% resistant), grade 4 (51-75% resistant), grade 3 (26-50% resistant), grade 2 (1-25% resistant) and grade 1 (Zero, fully sensitive) were recorded. Clones were graded in terms of trunk quality and branch density. The results of the 10-year performance evaluation indicated that clones of P.a.72.7 and P.a.49/39 than to Melanophyla picta Pall., clones of P.n.56.72, P.a.72.7, P.a.44.9, P.a.49.39 and P.a.17.60 than to Paranthrene tabaniformis, and clones of P.n.betulifolia, P.a.72.7, P.a.44.9, P.a.49.39, P.n.63.135, and P.a.17.60 than to Phloeomyzus passerinii Sign. were completely resistant. Clones of P.n.betulifolia, P.n.56.72, P.a.72.7, P.a.44.9, P.a.49.39 and P.a.17.60 were more resistant to all pests and clones of P.n.72.13, P.n.72.11, P.n.47.40 and P.n.72.18 were in the most contaminated condition. P.n.72.11, P.n.72.19, and P.n.72.5 clones had smooth and straight trunks and low branch density. The suitable clones of P.n.56.72, P.n.72.19, P.a.72.7, and P.a.44.9 are selected and introduced for cultivation in Populus plantations in Markazi province. These clones are selected based on resistance to pests and trunk quality.

Keywords


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