جستجوی مقالات مرتبط با کلیدواژه « آستانه حداقل دمایی » در نشریات گروه « گیاهپزشکی »

The pistachio fruit hull borer moth, Arimania komaroffi Ragonot (Lepidoptera: Pyralidae) has become a major pest of pistachio in recent years. The purpose of this study was to determine the lower threshold temperature and thermal constant of this pest under laboratory condition which can be used in predicting the time of pest control. Immature stages of this pest were reared at four constant temperatures 25, 27.5, 30, 32.5 and 35°C (±1), 65±5% RH, and 16:8 L:D photoperiod on fruit of Ohadi pistachio cultivar in growth chamber. Lower threshold temperature (T0) and thermal constant (K) of various stages of this pest were calculated with ordinary linear regression method and Ikemoto & Takai method. Moreover, thermal requirements for different generations of pest were determined under the field conditions during two years, 2013-2014. According to the results the lower threshold temperature for total immature stage (from egg to adult emergence) of this pest with ordinary linear regression and Ikemoto & Takai were 10.29 and 10.42°C, respectively. Thermal constant for completing immature period (egg to adult emergence) was calculated as 826.05 and 820.11 degree-days with ordinary linear regression and Ikemoto & Takai equations, respectively. Thermal requirements were measured as 763.7, 750.9 and 811.7 DD for first, second and third generations under field conditions which is consistent with laboratory results. Results of this study could be used in forecasting and pest management of this pest.