Tarbiat Modares University Journal of Agricultural Science and Technology 1680-7073 12 5 2010 10 01 Seasonal Activity of Zetzellia mali (Stigmaeidae) and Its Preys Eotetranychus frosti (Tetranychidae) and Tydeus longisetosus (Tydeidae) in Unsprayed Apple Orchards of Maragheh, Northwestern of Iran 549 558 14936 EN S. Khodayari Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, P. O. Box: 14115-336, Tehran, Islamic Republic of Iran. Y. Fathipour Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, P. O. Box: 14115-336, Tehran, Islamic Republic of Iran. K. Kamali Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, P. O. Box: 14115-336, Tehran, Islamic Republic of Iran. B. Naseri Department of Plant Protection, Faculty of Agriculture, University of Mohaghegh Ardabili, Ardabil, Islamic Republic of Iran. B. Naseri Department of Plant Protection, Faculty of Agriculture, University of Mohaghegh Ardabili, Ardabil, Islamic Republic of Iran. Journal Article Seasonal activity and spatial distribution of Eoteranychus frosti Mcgregor, Tydeus longisetosus (ElBagouy and Momen) and Zetzellia mali Ewing were studied during 9th July to 22th October 2006 in an unsprayed apple orchard, Maragheh region, Northwest of Iran. Also the density dependence interaction between preys and predator was assessed. To estimate the spatial distribution pattern of these species, data was analyzed through Iwao's patchiness regression, Taylor's power law, Morisita's coefficient, Lloyd's mean crowding and index of dispersion. Iwao’s patchiness regressions and Taylor’s power law showed a random and Morisita’s coefficient, Lloyd's mean crowding and index of dispersion revealed an aggregated distribution pattern for E. frosti, T. longisetosus and Z. mali. The results indicated that the peak density of E. frosti and T. longisetosus occurred in mid September and in late August (2.46 and 4.4 per leaf, respectively). Regarding their predator, the peak density (10.34) occurred in early July. The linear regression between prey and predator densities indicated a density independent predation by Z. mali. https://jast.modares.ac.ir/article_14936_500d2e6424f6fe03447c9d3545e6b376.pdf