ISSN:
1570-7458
Keywords:
cabbage seed weevil
;
Ceutorhynchus assimilis
;
oilseed rape
;
Brassica napus
;
host-plant volatile
;
olfactometer
;
(Z)-3-hexen-1-ol
;
methyl salicylate
;
nitriles
;
cyanides
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The cabbage seed weevil, Ceutorhynchus assimilis Payk. [syn. Ceutorhynchus obstrictus (Marsham)] (Coleoptera: Curculionidae), a crucifer-feeding insect, is a pest of oilseed rape (Brassica napus L.). It is known to be attracted by isothiocyanates, crucifer-specific volatiles that are metabolites of the glucosinolates. The responses of this insect to other electrophysiologically-active volatiles from rape were tested in a linear track olfactometer. Attraction was demonstrated to nitriles (phenylacetonitrile, 4-pentenenitrile and 5-hexenenitrile), which are also glucosinolate metabolites, and to volatiles emitted by a wider spectrum of plant families ((Z)-3-hexen-1-ol and methyl salicylate). Combination of an isothiocyanate mixture with phenylacetonitrile increased attraction, but there was no such increase when the isothiocyanate mixture was combined with methyl salicylate. A mixture of 23 volatiles, emulating an attractive air-entrainment extract of oilseed rape, was not significantly attractive, although a high proportion of weevils (60%) turned towards it. The potential of these volatiles for inclusion into an isothiocyanate-based monitoring system is discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1003140219888
