Intraguild predation by Hippodamia variegata (Col.: Coccinellidae) on the parasitoid wasp, Lysiphlebus fabarum (Hym.: Braconidae)

Authors

1 M.Sc. student in Entomology, Department of Plant Protection, College of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran

2 Department of Plant Protection, College of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran

3 Laboratory of Forest Ecology Graduate School of Agriculture Kyoto University, 606-8502 Japan

Abstract

Intraguild predation is defined as killing and eating another predator species as potential competitors that depends upon the same or limited resources. In this study, intraguild predation between the ladybird Hippodamia variegata Goeze and the parasitoid wasp Lysiphlebus fabarum (Marshall) was investigated in association with cotton aphid, Aphis gossypii, on cucumber plants. Host preference for healthy or previously parasitized aphids in third instar larvae and adult females of H. variegata was studied in a choice access situation as well as in a Y-tube olfactometer bioassay. We cut an antenna of each experimental aphid to reliably distinguish  the parasitized aphids from healthy ones. All experiments were performed at 22±1°C, 60%–70% RH, and a 16:8 (L:D) photoperiod. Based on the pre-test results, cutting the antenna of aphids, did not significantly affect the host preference of adults or third instar larvae of ladybirds. In a choice access test, female ladybirds significantly preferred healthy aphids to previously parasitized ones (24 and 72 hours: t =2.15, df =1,18, P =0.04 and t =6.35, df =1,18, P <0.001, respectively), but third instar larvae behaved differently  (t =0.58, df =1,18, P =0.56). According to olfactometer test results, female ladybirds preferred neither healthy aphids nor parasitized ones (χ2 =1.6, df =1,19, P =0.21). It is concluded that preference for healthy aphids over parasitized ones by adult female of H. variegata  facilitates the simultaneous application of the both biocontrol agents, H. variegata and L. fabarum. 

Keywords

References

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Journal of Entomological Society of Iran
Volume 36, Issue 3 - Serial Number 66
December 2016
Pages 205-216

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