Effect of storage temperature on the parasiticabilityofPyemotes tritici
Author of the article:LIU Jie1** LUO You-Qing1 ZONG Shi-Xiang1 WANG Jin-Lin2SONG Dong-Bing3 TAO Jing1***
Author's Workplace：1. The Key Laboratory of Beijing for Control to Forest Pest, Beijing Forestry University, Beijing, 100083, China;2. Bureau of Ningxia Habahu National Nature Reserve, Yanchi, 751500, China; 3. Forest Pest Control andQuarantine Station of Ningxia, Yinchuan, 755000,China
Key Words： Artemisia ordosica woodborers, storage temperature, parasitoids
Abstract： [Objectives] Pyemotes tritici (Newport) is one of the most important parasitoids of woodborers such as Adosopius sp. and Sphenoptera sp. associated with Artemisia ordosica. [Methods] The influence of temperature and cooling mode on the parasitic ability of P. tritici were assessed. [Results] The offspring of P. tritici stored at 0℃ displayed stronger parasitic ability. When the storage temperature exceeded 10 d, the number of offspring and parasitic capacity decreased over time. When storage temperature exceeded 0oC, the maximum storage time of P. tritici decreased inversely with risingtemperature. Using different storage methods for P. tritici to reach low temperatures required different recovery times when returning to normal temperature conditions, and resulted in different parasitic rates and variable body size of the offspring. The recovery time of P. tritici stored after gradual cooling was slightly higher than that of parasitoids stored directly at low temperature. [Conclusion] The optimum storage conditions of P. tritici was 10 d at 0℃. These results provide theoretical support for the low temperature storage of P. tritici.