Reproductive performance on different host substrate by theocolax elegans (Westwood) (Hymenoptera : Pteromalidae), a larval parasitoid of stored product insects

Name: Saruta Sitthichaiyakul

LCSH: Kasetsart University -- Dissertations. Ph.D. (Entomology) 2017

Classification :.LCCS: QL568.P94

LCSH: Kasetsart University. Department of Entomology -- Dissertations

LCSH: Pteromalidae

LCSH: Parasitoids

LCSH: Food storage pests

Abstract: The solitary parasitoid Theocolax elegans (Westwood) (Hymenoptera: Pteromalidae) was investigated attacking larvae of the maize weevil, Sitophilus zeamais (Motschulsky) (Coleoptera: Curculionidae) under laboratory conditions. Theocolax elegans parasitoids were mass reared on 21 days-old S. zeamais fed with different host-substrate grains consisting of brown rice, maize, sorghum and wheat. The widest head capsule was recorded from S. zeamais developing in brown rice grain kernels. The head capsule width was used to determine the age of the larval instars. The sex ratio of T. elegans progeny emerging from brown rice was the same in the choice and no-choice tests. Female parasitoids preferred to oviposit on S. zeamais developed in brown rice grain kernels in both tests. The number of parasitoid progeny emerging from different host-substrate grains was different in the choice and no-choice tests (F-test, 0.05). I investigated host-age preference of T. elegans using choice and no-choice laboratory experiments. Sitophilus zeamais larvae (14, 21 and 28 days-old) in brown rice and uninfested brown rice grains (control) were exposed for two days to neonate T. elegans mated females to lay their eggs. The experimental data showed that the highest numbers of parasitoids emerged from 28 days-old S. zeamais larvae. The numbers of parasitoids emerging from 21 and 28 days-old S. zeamais larvae were not statistically significantly different in choice experiments. In contrast, the numbers of progeny emerging from no-choice experiments were statistically significantly different (F-test, 0.05). Neonate, honey-fed T. elegans females lived longer than honey-deprived neonate T. elegans females (T-test, 0.05). The progeny of T. elegans females and males were fully-winged (macropterous), short-winged (brachypterous) and wingless (apterous). Fore wing, hind tibia and body length-width of parasitoid progeny have been analyzed in these studies and shown to be good indicators of wasp vitality. The progeny of T. elegans produced from S. zeamais larvae developed in brown rice grain kernel was greater than all progeny emerged from other grains. Theocolax elegans progeny emerging from S. zeamais larvae 28 days-old produced the largest body size in both female and male wasp progeny.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Weerawan Amornsak

Role: Thesis Advisor

Name: Gordon Gordh

Role: Thesis Co-Advisor

Created: 2017

Modified: 2023-06-28

Issued: 2023-06-28

วิทยานิพนธ์/Thesis

application/pdf

URL: https://kasetsart.idm.oclc.org/login?url=https://www.lib.ku.ac.th/KUthesis/2560/saruta-sit-all.pdf

CallNumber: QL568.P94.S27

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Entomology

Grantor: Kasetsart University

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