Host preference and switching of two populations of Trissolcus vassilievi between two host populations

Document Type : Research Paper

Authors

1 Department of Animal Biology, Faculty of Natural Science, University of Tabriz, Tabriz, Iran

2 Department of Plant Protection, Faculty of Agriculture, University of Tabriz, Tabriz, Iran

3 Plant Protection Research Department, Tehran Agricultural and Natural Resources Research and Education Center, AREEO, Varamin, Iran

Abstract

Host selection by parasitoids has vital effects on their fitness. Trissolcus vassilievi (Hym., Platygastridae) is a species with high biological potential in sunn pest control. Those parasitoids that develop in higher quality hosts are more vital and fecund than those develop in lower quality hosts. In this study, host preference and switching behavior of two populations of T. vassilievi (Tabriz and Varamin) was investigated on the same populations of the host at ratios of 5:1, 4:2, 3:3, 2:4 and 1:5 clutches. Host measurements revealed that host eggs was significantly heavier in the Varamin bugs than the Tabriz ones. The Varamin wasps were also larger than the Tabriz wasps and the progeny of the crosses was closer to the maternal populations. Data analysis was done by Murdoch (1969) and Cock (1978) methods. Referring to the values of c1 (preference index for Tabriz sunn pest) and c2 (preference index for Varamin sunn pest), Varamin population of T. vassilievi presented negative tendency to Tabriz host and positive tendency although non-significant to Varamin host. Linear regression analysis also showed significant trend of the parameter "c" over the host ratio in both parasitoids which confirms presence of switching behavior. In general, we can say that difference between host populations is less considerable than what can affect host-preference by the wasp.

Keywords

References

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BioControl in Plant Protection
Volume 5, Issue 2 - Serial Number 10
December 2018
Pages 27-42

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