رشد و نمو مراحل نابالغ کنهTetranychus kanzawai (Acari: Tetranychidae) با تغذیه از برگ های سویا در شش دمای ثابت

The superfamily Tetranychoidea are obligatory phytophagus mites assigned to five recognized families. Most of species that are of major economic importance are contained in two families, Tetranychidae and Tenuipalpidae. Tetranychus kanzawai Kishida is a phytophagous mite which infesting various plant throughout the world. This phytophagous mite was recorded in different regions of Iran and its population increased in recent years. Temperature is the main abiotic factor influencing the development and distribution of insects and mites. In this research the effect of six constant temperatures of 15, 20, 25, 30, 35 and 37ºC on developmental time of T. kanzawai were determined under laboratory conditions 65%±5% RH and a photoperiod of 16 : 8 (L : D) h on soybean leaves. Total developmental time of females (from egg to adult emergence) at the above-mentioned temperatures was ranged from 5.56 at 35ºC to 28.55 days at 15ºC. Developmental rate of the T. kanzawai increased as temperature increased from 15 to 35ºC, but declined at 37ºC. Ordinary linear and nonlinear model Lactin were fitted to developmental rate of immature stages of T. kanzawai to predict the developmental rate as a function of temperature, as well as to estimate the thermal constant (K) and critical temperatures (Tmin, Topt and Tmax). The estimated values of the Tmin and K for total developmental time using the linear model were 10.72ºC and 134.58 degree-days (DD), respectively. The estimated Topt for overall immature stage development of T. kanzawai by the Lactin model was 36.20◦C. These information are applied to improve the management of T. kanzawai in field condition.