New Zealand Journal of Crop and Horticultural Science abstracts
Electroantennogram and oviposition responses
of Epiphyas postvittana (Lepidoptera: Tortricidae)
to plant volatiles
D. M. SUCKLING
G. KARG
A. R. GIBB
S. J. BRADLEY
The Horticultural & Food Research
Institute of New Zealand
P.O. Box 51
Lincoln, New Zealand
Abstract Electroantennogram (EAG) responses of male and
female Epiphyas postvittana (lightbrown apple moth) were recorded to
plant volatiles delivered from either filter paper or a gas chromatograph.
Males showed significantly higher EAG responses than females with both methods
(P < 0.001). Responsiveness to compounds was significantly
correlated between sexes and between methods (P < 0.01). Pairs of
moths were caged with access to filter paper treated with plant volatiles, and
untreated filter paper, for oviposition. The number of females ovipositing, the
number of eggs laid, and the proportion of total eggs laid on the treated paper
were recorded to determine the attractancy or repellency of the compounds.
Eugenol, geraniol, and citral deterred oviposition, whereas hexanal, linalool,
nonanol, octanol, and nonanal were attractants. The proportion of females
laying eggs was reduced in the presence of citral, nonanol, octanol, and
n-decyl aldehyde. The number of fertile eggs laid per female was reduced by 10
of the 14 compounds tested. EAG was a poor predictor of oviposition attractancy
or repellency. Stimulation with fresh plant foliage produced significantly
higher EAGs in eight host plants, compared to eight non-hosts (P <
0.001).
Keywords electroantennogram; plant volatiles; host plant;
oviposition; repellency; attractancy; Epiphyas postvittana
New Zealand Journal of Crop and Horticultural Science, 1996, Vol. 24:
323-333
0114-0671/96/2404-0323 $2.50/0 (c) The Royal Society of New Zealand
1996
PDF file of entire paper: medium quality (836K); (scanned from paper original: notes about this process)
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