Subject Areas : entomology and othea arthropods

Sh. Vafaei ¹ ( Graduated student, Department of Entomology, Islamic Azad University, Arak Branch, Arak, Iran )
Sh. Goldasteh ² ( Department of Entomology, Agricultural faculty, Islamic Azad University, Arak Branch, Arak, Iran )
A. A. Zamani ³ ( Department of Plant Protection, Razi University, Kermanshah, Iran )
E. Sanatgar ⁴ ( Department of Entomology, Agricultural faculty, Islamic Azad University, Arak Branch, Arak, Iran )

Received: 2009-02-11 Accepted : 2009-12-12 Published : 2010-02-20

Keywords:

Abstract :

In this study the biological parameters (life table, reproduction, population growth rate) of the predatory bug Orius albidipennis Rueter (Hem., Anthocoridae) were studied on Tetranychus urticae Kochreared on three cultivars of soybean. The experiment was conducted in laboratory conditions at 251oC, % 655 R.H and a photoperiod of 16:8 hours (L:D). There were no significant differences between mean incubation period and mean preimaginal developmental times on three cultivars of soybean. On three soybean cultivars, the females develpopmental time were higher than males. Net reproducation rate (R0), the intrinsic rate of increase (Rm), finite rate of increase (), mean generation time (T) and doubling time (DT) calculated for O. albidipennis were respectivety 3, 7.14, 0.08, 1.09, 22.44 and 7.89 on Gorgan, 9.68, 0.09, 1.10, 22.87 and 6.96 on DPX, 3.65, 0.05, 1.05, 22.30 and 11.88 on Williams.