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Biology and development of Chaetophthalmus dorsalis (Malloch) (Diptera: Tachinidae) parasitising Helicoverpa armigera (Hübner) and H. punctigera Wallengren (Lepidoptera: Noctuidae) larvae in the laboratory

Citation

Walker, PW, Biology and development of Chaetophthalmus dorsalis (Malloch) (Diptera: Tachinidae) parasitising Helicoverpa armigera (Hubner) and H. punctigera Wallengren (Lepidoptera: Noctuidae) larvae in the laboratory, Australian Journal of Entomology, 50, (3) pp. 309-318. ISSN 1326-6756 (2011) [Refereed Article]


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Copyright Statement

Copyright 2011 Australian Entomological Society

DOI: doi:10.1111/j.1440-6055.2011.00820.x

Abstract

Chaetophthalmus dorsalis is a common larval parasitoid of several economically important species of Noctuidae in Australia but little is known about its biology. This paper describes aspects of the behaviour and development of C. dorsalis parasitising Helicoverpa armigera and H. punctigera larvae in the laboratory. At 25°C, C. dorsalis laid a mean of 577 ovolarviparous eggs, 8–9 days after emergence. Parasitoids were able to complete development when newly emerged planidia were placed on all host instars except first instars. Planidia manually placed on the dorsum of the first thoracic segment of host larvae showed no preference to penetrate segments immediately behind the head capsule where they could not be removed by the host. Planidia were significantly faster at penetrating the cuticle of early- (second to fourth) instar compared with late- (fifth and sixth) instar larvae, and late-instar H. punctigera larvae compared with equivalent instars of H. armigera. Parasitoid larval development was significantly faster when planidia were placed on late-instar H. punctigera larvae than on early-instar larvae but puparium development and puparium weight were not affected by host age. Parasitised Helicoverpa larvae gained weight at the same rate as unparasitised larvae until 2–3 days before the exit of C. dorsalis larvae when they entered a premature prepupal phase. Developmental thresholds and day-degree requirements for C. dorsalis were calculated and compared with H. armigera. A new host record for C. dorsalis reared from Neocleptria punctifera (Noctuidae) larvae is given.

Item Details

Item Type:Refereed Article
Keywords:Diptera, Helicoverpa, Helicoverpa armigera, Helicoverpa punctigera, Lepidoptera, Noctuidae, Tachinidae, ovolarviparous, planidia, tachinid,
Research Division:Agricultural and Veterinary Sciences
Research Group:Crop and Pasture Production
Research Field:Crop and Pasture Protection (Pests, Diseases and Weeds)
Objective Division:Environment
Objective Group:Control of Pests, Diseases and Exotic Species
Objective Field:Control of Plant Pests, Diseases and Exotic Species in Farmland, Arable Cropland and Permanent Cropland Environments
Author:Walker, PW (Dr Paul Walker)
ID Code:66973
Year Published:2011
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2011-02-21
Last Modified:2012-08-27
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