برآورد آستانه پایین دمایی و نیاز گرمایی نشو و نمای کنه تارتن دو نقطه‌ای Tetranychus urticae (Acari: Tetranychidae) با استفاده از مدل‌های خطی "روز-درجه" و "ایکموتو و تاکایی"

Tetranychus urticae (two-spotted spider mite) is the most widely known member of the family Tetranychidae or spider mites.In order to provide a phenological forecasting model, estimation of lower temperature threshold and thermal requirements are necessary. Therefore, current study was carried out to estimate lower temperature threshold and thermal requirements of Tetranychus urticae (Acari: Tetranychidae) using Degree-days and Ikemoto and Takai linear models. Developmental times of the two-spotted spider mite immature stages were determined at four constant temperatures, 15, 20,25 and 30ºC on four hosts of bean, rose, almond and common mulberry, a photoperiod of 16L: 8D h and 60±5% relative humidity. Between examined linear models, for the egg stage on almond, berry and bean hosts, the Ikomoto and Takai model and on the rose, the linear model and for overall immature stages, except for the bean (where the Ikoto and Takai model was better), on the rest of the investigated plants, the linear model estimated lower temperature threshold and thermal requirements with higher accuracy. Based on the estimations of investigated models, lower temperature threshold of egg stage of T. urticae on bean, rose, almond and common mulberry, were 10.02±0.11, 10.71±1.5, 10.62±0.2 and 10.10±0.21ºC and for overall immature stages were 10.11±0.17, 7.07±0.42, 8.51±0.25 and 7.80±0.17ºC respectively. Thermal requirements of egg stage were 40.42±0.57, 84.23±5.24, 36.82±0.97 and 49.08±1.3 and for overall immature stages were 112.5±2.31, 159.63±4.4, 134.79±2.42 and 156.53±1.85 degree-days respectively.