Eur. J. Entomol. 109 (4): 503-508, 2012 | DOI: 10.14411/eje.2012.063

Survival and developmental characteristics of the predatory bug Orius similis (Hemiptera: Anthocoridae) fed on Tetranychus cinnabarinus (Acari: Tetranychidae) at three constant temperatures

Shi-Chang ZHANG*, Fen ZHU, Xia-Lin ZHENG, Chao-Liang LEI, Xing-Miao ZHOU**
Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China

Developmental characteristics of the predatory bug Orius similis fed on Tetranychus cinnabarinus were investigated at three constant temperatures (25, 28, and 31C) under laboratory conditions (75±5% relative humidity and a 14L : 10D photoperiod). The survival of nymphs was highest at 28C (75.57%) and at this temperature female adults O. similis had the longest oviposition period (21.1 d), the greatest fecundity (40.3 eggs) and the highest potential intrinsic rate of increase (rm: 0.108 d-1). These results suggest that O. similis can maintain greater population densities at 28C than at the other temperatures tested. In addition, the functional response indicates that the attack rate of O. similis (1.04) and the maximum prey capacity (30.7 spider mites per bug in 24h) are greatest at 28C. The results of this study provide useful information on the biology and time when to release O. similis in order to reduce the abundance of T. cinnabarinus in cotton fields.

Keywords: Hemiptera, Anthocoridae, Orius similis, Acari, Tetranychidae, Tetranychus cinnabarinus, biological control, development characteristics, functional response

Received: February 13, 2012; Accepted: June 15, 2012; Published: October 5, 2012

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