Life Tables and Predation Rates of Hippodamia Variegata (Goeze) and Adalia Fasciatopunctata Revelieri (Mulstant) (Coleoptera: Coccinellidae) on Aphis Fabae (Scopoli) (Hemiptera: Aphididae)

Abstract

Predation rates, reproduction, development, and life table parameters of Hippodamia variegata (Goeze) and Adalia fasciatopunctata revelieri (Mulstant) (Coleoptera: Coccinellidae) on black bean aphid, Aphis fabae (Scopoli) (Hemiptera: Aphididae), which causes significant losses in broad bean, Vicia faba (L.) (Fabaceae) plants, were determined according to the age-stage, two-sex life table. The experiments were carried out in a climate room with a temperature of 25 +/- 1 degrees C, 60 +/- 5% RH, and 16: 8 h light: dark conditions. The life table parameters of the predators were as follows; H. variegata and A. fasciatopunctata revelieri the intrinsic rate of increase (r) 0.18 +/- 0.09 day-1 and 0.15 +/- 0.01 day-1, the finite rate of increase (lambda) 1.20 +/- 0.01 day-1 and 1.16 +/- 0.02 day-1, the net reproduction rate (R0) 210.83 +/- 53.05 and 66.54 +/- 23.06 individuals, mean generation time (T) 29.33 +/- 0.54 and 27.92 +/- 1.55 days respectively. The net predation rate (C0) of H. variegata and A. fasciatopunctata revelieri on A. fabae were 1075.14 +/- 95.28 and 436.23 +/- 80.19 aphids respectively. As a result of the evaluation of the reproduction, development, life table, predation rates, and predation parameters of the predators, the effectiveness of both predators on pests was proved and it was revealed that H. variegata was a more effective predator on A. fabae than A. fasciatopunctata revelieri.