Functional responce and prey preference ofHippodamia variegata(Goeze)toAphis gossypii )Glover)and Myzus persicae (Sulzer) on cucumber plant

Elahi, Maryam (2019) Functional responce and prey preference ofHippodamia variegata(Goeze)toAphis gossypii )Glover)and Myzus persicae (Sulzer) on cucumber plant. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Abstract: In this research, the functional response of fourth instar larvae and adult female of Hippodamia variegata (Goeze) was investigated to different densities (3, 5, 10, 20, 40, 80, 140 and 200) of 4-d-old nymphs of Aphis gossypii (Glover) and Myzus persicae (Sulzer). Also,the prey preference of fourth instar larvaeand adult female of H. variegata was investigated to these two aphid species in five different ratios of 60:60, 40:80, 80:40, 20:100 and 100:20 (M. persicae : A. gossypii).The experiments were carried out under controlled conditions (25 ± 2 °C, 70 ± 5% RH and 16:8 L:D h). Before the experiment, the predators starved for 24 h. The experiments were conducted in Petri dishes containing cucumber leaves for 24 h in 10 replicates. The logistic regression analysis showed a type II functional response for fourth instar larvae and adults females.The attack rates (a)of predator larvae on A. gossypii and M. persicaewere estimated 0.1738±0.0135 h−1 and 0.1020±0.00809 h and handling times (Th) were 0.0493±0.0069 h and 0.0340 ± 0.00991h, respectively; and for adult predator were 0.1241 ± 0.0096 h−1 and 0.0422±0.0084 h, respectively.The Manly´s preference index for fourth instar larvae of the predator in above-mentioned prey ratios were estimated to be 0.3614 and 0.6386, 0.2626 and 0.7374, 0.3400 and 0.6600, 0.2486 and 0.7514; 0.3650 and 0.6350 and for adults females 0.3703 and 0.6297; 0.2878 and 0.7122; 0.3593 and 0.6407; 0.2599 and 0.7401; 0.3916and 0.6084, respectively. The results showed that both fourth instar larvae and adult female of the predator more preferred A. gossypiimore thanM. persicae.

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