Library Open Repository

Eucalypt hybrid susceptibility to Gonipterus scutellatus (Coleoptera: Curculionidae)

Downloads

Downloads per month over past year

Dungey, HS and Potts, BM (2003) Eucalypt hybrid susceptibility to Gonipterus scutellatus (Coleoptera: Curculionidae). Austral Ecology: a journal of ecology in the Southern, 28 (1). pp. 70-74. ISSN 1442-9985

[img] PDF
Dungey_et__al__Austral__Ecology__2003.pdf | Request a copy
Full text restricted
Available under University of Tasmania Standard License.

Abstract

Damage caused by the eucalypt snout weevil Gonipterus scutellatus Gyllenhal (Coleoptera: Curculionidae) (= G. gibberus Boisduval) was found on a greater proportion of F 1 Eucalyptus amygdalina Labill. E. risdonii J. D. Hook. hybrid trees than either of the pure species, in a replicated field trial in south-east Tasmania. A greater proportion of E. risdonii trees was also damaged than E. amygdalina trees. A study of the pattern of oviposition within the trial revealed no difference in oviposition by G. scutellatus between E. risdonii and E. amygdalina . Oviposition by G. scutellatus was significantly higher on the F 1 and F 2 interspecific hybrids between these two eucalypt species compared with pure species crosses. There were no apparent differences in damage or oviposition levels between the F 1 hybrids and the single large F 2 progeny included in the trial. This finding provides little evidence that hybrid susceptibility is due to hybrid breakdown after the first generation. Rather, the evidence is consistent with the hypothesis that there may be different mechanisms of host defence operating in each species that are somehow diluted below a threshold level in the hybrids.

Item Type: Article
Keywords: Eucalyptus amygdalina , Eucalyptus risdonii , Eucalyptus snout weevil, hybrid susceptibility, host preference, insect damage, interspecific hybrids.
Journal or Publication Title: Austral Ecology: a journal of ecology in the Southern
Page Range: pp. 70-74
ISSN: 1442-9985
Identification Number - DOI: 10.1046/j.1442-9993.2003.01250.x
Additional Information: BM Potts. The definitive version is available at www.blackwell-synergy.com
Date Deposited: 29 Feb 2008 00:25
Last Modified: 18 Nov 2014 03:30
URI: http://eprints.utas.edu.au/id/eprint/3365
Item Statistics: View statistics for this item

Repository Staff Only (login required)

Item Control Page Item Control Page