تأثیر سه رقم خیار گلخانه‌ای بر ویژگی‌های جدول زندگی کنه تارتن دو لکه‌ای Tetranychus urticae

Life history parameters of plant feeders are useful tools to evaluate resistance or susceptibility of host plants including different cultivars. This study is compared population growth parameters of Tetranychus urticae Koch on three greenhouse cucumber cultivars, including Negeen (foreign cultivar), Aiylar and Sourena (Iranian cultivar which is called “Danje”) in laboratory conditions at 25±1 °C, 70±5% relative humidity, and a photoperiod of 16:8 (L:D) h.The data were analyzed, based on the age- stage, two- sex life table theory. The life table of a population gives the most comprehensive description on the growth, survival and fecundity. The immature development time was different among the tested cucumber cultivars and were 11.23 (Negeen), 10.75 (Aiylar) and 10.41 day (Sourena).The results revealed that mite fecundity varied from 51.56 eggs/female on Aiylar, 48.06 eggs/female on Negeen to 36.59 eggs/female on Sourena. The lowest intrinsic rate of increase (r) was recorded on Sourena (0.20 day-1) and this parameter was relatively higher on Aiylar (0.24 day-1) and Negeen (0.23 day-1). The value of the net reproductive rate (R0) were 38.67 offspring on Aiylar, 37.14 offspring on Negeen and 25.92 offspring on Sourena. Based on this data Aiylar and Negeen were significantly higher than Sourena. In addition, the mean generation time (T) was calculated on Sourena, Negeen and Aiylar ( 15.35, 15.42 and 15.09 days, respectively) that were no significant different between them. Comparison of life table parameters of T. urticae on different greenhouse cucumber cultivars revealed that Sourena were the most resistant cultivars to this pest and have the potential to be used for integrated pest management instead of foreign cultivars.