Prey preference of Hippodamia variegata (Goeze) larvae to the melon aphid, Aphis gossypii (Glover) and the green peach aphid, Myzus persicae (Sulzer) on cucumber

الهی, مریم and حسن پور, مهدی and رفیعی دستجردی, هوشنگ and گلی زاده, علی Prey preference of Hippodamia variegata (Goeze) larvae to the melon aphid, Aphis gossypii (Glover) and the green peach aphid, Myzus persicae (Sulzer) on cucumber. In: 2nd International and 6th National Iranian Congress on Organic vs. Conventional Agriculture, August 2019, Ardabil, Iran.

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Abstract

Aphis gossypii (Glover) and Myzus persicae (Sulzer) are of the most important pests of cucumber in the greenhouse. Hippodamia variegata (Goeze) is one of the important predators of aphids. In this research, the preference of fourth instar larvae of H. variegata was investigated to different densities of these aphids (60:60, 40:80, 80:40, 20:100 and 100:20; (M. persicae : Aphis gossypii). The experiments were carried out at 25 ± 1 °C, 70 ± 10% RH and 16L:8D h. The predators were removed from the test arena after 24h and the number of preys eaten was recorded. The mean prey consumption by the predator larvae in above densities was 36.8 ± 1.12 and 48.6 ± 0.93; 21.30 ± 0.47 and 70.50 ± 0.65; 41.70 ± 0.78 and 30.50 ± 1.16; 9.80 ± 0.41 and 86.90 ± 1.08; 69 ± 2.49 and 17.30 ± 1.33, resp. The Manly´s preference index for above densities was estimated to be 0.3614:0.6386; 0.2626:0.7374 0.3400:0.6600; 0.2486:0.7514; 0.3650:0.6350, respectively indicating that A. gossypii was more preferred than M. persicae by the predator.

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