Survey of Populus leaf miner Lithocolletis populifoliella tr. density on different Populus clones in West Azerbaijan

Lithocolletis populifoliella tr. is one of the important pests of Populus plantations in West Azarbaijan Province and field observations indicate that activity of this pest has been noticeable on different clones, specially Populus, during recent years. This survey was conducted in order to determinae of density and L.populifoliella of,on 10 clones of Populus (Populus nigra and P.eauramericana)in Station Populus Research of Saatloo in Urmia, during 2005-2007.The clones were cultured in RCBD (with 3×3 meters distance), in three replications (75saplings from each clones in 3 replications). From first of April to late September (once in ten days) and due to removal of additional effects,16 sapling from 25 saplings in each replicate were selected. The number of L.populifoliella larvae was counted. On each samples (number of four 20 cm branches in four geographical directions). some branches were covered for determining L.populifoliella date of peak flight and adultstu be captured.Results showed that high and low density of L.populifoliella were recorded on Populus nigra 63/135 and P.eauramericana 488 clones, respectively.The flight peak of this pest in 2005 and 2006 were observed on the middle of June (the first generation) and the middle of July for the second generation. The flight peak in 2007 due to warm condition for the first and second generations of L.populifoliella were observed on the first of June and late June, respectively.