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The lethal and sub-lethal consequences of entomopathogenic nematode infestation and exposure for adult pine weevils, Hylobius abietis (Coleoptera: Curculionidae)

Record type: Article

Entomopathogenic nematodes (EPN) frequently kill their host within 1–2 days, and interest in EPN focuses mainly on their lethality. However, insects may take longer to die, or may fail to die despite being infected, but little is known about the effects of EPN infection on insects, other than death. Here we investigate both lethal and sub-lethal effects of infection by two EPN species, Steinernema carpocapsae and Heterorhabditis downesi, on adults of the large pine weevil, Hylobius abietis. Following 12 h nematode–weevil contact in peat, S. carpocapsae killed a significantly higher proportion of weevils (87–93%) than H. downesi (43–57%) at all concentrations tested. Less than 10% of weevils were dead within 2 days, and weevils continued to die for up to 10 days after exposure (LT50 of 3 days or more). In a separate experiment, live weevils dissected 6 days after a 24 h exposure to nematodes on filter paper harbored encapsulated and dead nematodes, showing that weevils could defend themselves against infection. Some live weevils also harbored live nematodes 6 days after they had been removed from the nematode infested medium. Feeding by weevils was not affected by infection with, or exposure to, either species of EPN. We discuss these results in relation to the use of EPN in biological control against H. abietis.

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Citation

Girling, R.D., Ennis, D., Dillon, A.B. and Griffin, C.T. (2010) The lethal and sub-lethal consequences of entomopathogenic nematode infestation and exposure for adult pine weevils, Hylobius abietis (Coleoptera: Curculionidae) Journal of Invertebrate Pathology, 104, (3), pp. 195-202. (doi:10.1016/j.jip.2010.04.003).

More information

Published date: July 2010
Keywords: hylobius abietis, steinernema carpocapsae, heterorhabditis downesi, feeding behavior, biological control, lt50, lt90

Identifiers

Local EPrints ID: 167221
URI: http://eprints.soton.ac.uk/id/eprint/167221
ISSN: 0022-2011
PURE UUID: 91bb5856-1e10-4f35-95cd-76c34e0076c7

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Date deposited: 10 Nov 2010 09:24
Last modified: 18 Jul 2017 12:24

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Contributors

Author: R.D. Girling
Author: D. Ennis
Author: A.B. Dillon
Author: C.T. Griffin

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