Study on demographic parameters of Trichogramma brassicae (Bezdenko) (Hym., Trichogrammatidae) on three host species in laboratory conditions

Subject Areas : entomology and othea arthropods

A. A.  Lashgari ¹ (Entomology Department, Agricultural faculty, Tarbiat Modares University, Tehran, Iran)
A. A.  Talebi ² (Entomology Department, Agricultural faculty, Tarbiat Modares University, Tehran, Iran)
Y.  Fathipour ³ (Entomology Department, Agricultural faculty, Tarbiat Modares University, Tehran, Iran)
S.  Farahani ⁴ (Entomology Department, Agricultural faculty, Tarbiat Modares University, Tehran, Iran)

Received: 2009-09-17 Accepted : 2010-05-02 Published : 2010-05-22

Keywords:

Abstract :

Life table, reproduction and population growth parameters of Trichogramma brassicae Bezdenko were studied on eggs of two laboratory hosts, Ephestia kuehniella Zeller and Sitotroga cerealella Oliver and one natural host species eggs, Helicoverpa armigera Hubner. The experiments were carried out in a growth chamber with temperature of 25±1 °C, 50±5 % relative humidity and a photoperiod of 14L:10D hours. Adult life expectancy were 5.65, 9.45 and 4.95 days on eggs of H. armigera, E. kuehniella and S. cerealella, respectively. Gross fecundity rate of T. brassicae on eggs of E. kuehniella was higher than eggs of two other hosts. Net reproductive rate were 41.98, 55.65 and 42.17 females/female on H. armigera, E. kuehniella and S. cerealella, respectively. Intrinsic rate of increase of T. brassicae on eggs of H. armigera, E. kuehniella and S. cerealella were 0.298, 0.309 and 0.301 females/female/day, respectively. Mean generation time of T. brassicae was longer then on eggs of E. kuehniella.