Comparison of the biological characteristics of two local populations of Brevicoryne brassicae L. (Hem., Aphididae) on rape seed in laboratory conditions

Subject Areas : entomology and othea arthropods

F. Eskuruchi ¹ , A. A. Talebi ² , A. Hajgozar ³ , Sh. Goldasteh ⁴

1 - Department of Entomology, Faculty of Agriculture, Islamic Azad University, Arak Branch, Arak, Iran
2 - Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran
3 - Departement of Plant Protection, Faculty of Agriculture, Islamic Azad University, Shiraz Bracch, Shiraz, Iran
4 - Departement of Plant Protection, Faculty of Agriculture, Islamic Azad University, Arak Branch, Young Researchers club of Arak, Iran

Received: 2009-12-19 Accepted : 2010-05-07 Published : 2010-11-22

Keywords:

Abstract :

The cabbage aphid, Brevicoryne brassicae L. (Hem., Aphididae) is one of the most important pests of rapeseed and most other crucifera in many parts of the world. In this study, demographic parameters including life table, reproduction and population growth parameters of two populations of B. Brassica, collected fromShiraz and Gorgan, were studied. Experiments were conducted in laboratory conditions at 25±1ºC, 60±5% relative humidity and a photoperiod of 16:8 hours (L: D). Data were analyzed according to Jackknife method using SAS and MINITAB statistical softwares. The results indicated that, there was significant difference between mean preimaginal developmental time of aphid in two population of Shiraz and Gorgan (P<0.05). There was a significant difference between mean lifespan of aphid in two population of Shiraz and Gorgan. The life expectancy of newly emerged adults was 7.92 and 9.46 days in two populations of Shiraz and Gorgan, respectively. The gross fecundity rate in Shiraz population was higher than Gorgan population. There was a significant difference between gross fecundity rate in two population of Shiraz and Gorgan (P<0.01). The net reproduction rate was 9.22 and 7.54 females per female per generation in Shiraz and Gorgan population, respectively. The intrinsic rate of increase in two populations of Shiraz and Gorgan were 0.21 and 0.19 females/female/day, respectively. The finite rates of increase were obtained 1.23 and 1.21 days in Shiraz and Gorgan populations, respectively. The mean generation time of aphid was 10.58 and 10.48 days in two populations of Shiraz and Gorgan, respectively. The doubling time of aphid was 3.30 and 3.59 days in Shiraz and Gorgan populations, respectively.