بررسي اثر دما بر رشدونمو مراحل نابالغ سن شكارگر

Effect of temperature on development of immature stages of predatory bug Orius niger Wolff

Effect of seven constant temperatures (17, 20, 23, 26, 29, 32, 35 °C) on development of immature stages of the predatory bug Orius niger Wolff, under 16L : 8D photoperiod and 7015% RH, reared on Ephestia kuehneilla Zeller eggs, water and green bean pods were studied and their development rates modeled as a function of temperature. The mean development time of eggs, nymphs and egg to adult were 13.62, 51.4 and 65 days at 17 °C and, 3.73, 9.5 and 13.42 days at 32 °C respectively. Egg hatch was fluctuated between 70 and 87 %. The relationship between growth rate of the immature stages of the predatory bug and temperature has been fitted with one linear and 4 non-linear models. If we consider temperature ranging (17 - 29 °C), the linear model do accurately predict the developmental rate of O. niger adding more temperature ranging (17 - 32 °C), the non-linear model Briere-2 explained best relationship between temperature and developmental rate. The lower, the optimum and the lethal temperatures were 13.99, 31 and 39.86 °C respectively. It was estimated that 238 degree-day, above a developmental zero of 13.82 °C were required to complete development from egg to adult.