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Eucalypt hybrid susceptibility to Gonipterus scutellatus (Coleoptera: Curculionidae)

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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

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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
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