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  • 1
    Electronic Resource
    Electronic Resource
    The responses of the cabbage seed weevil (Ceutorhynchus assimilis) to the odour of oilseed rape (Brassica napus) and to some volatile isothiocyanates (1993)
    Springer
    Entomologia experimentalis et applicata 68 (1993), S. 295-302 
    Details
    ISSN: 1570-7458
    Keywords: Ceutorhynchus assimilis ; oilseed rape ; host plant volatiles ; attractant ; olfactometer ; isothiocyanate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The responses of the cabbage seed weevil,Ceutorhynchus assimilis Payk. (Coleoptera: Curculionidae) to volatiles from oilseed rape (Brassica napus L.) were tested using a linear track olfactometer. Weevils were attracted towards the odour of rape during a short period before diapause and for most of their postdiapause life. Odours from both the flowering and green parts of the plant were attractive, but the odour of a non-host plant (Bellis perennis L.) was not. An entrainment extract of flowering rape volatiles in pentane was attractive, but significantly less so than the odour of flowering rape itself. Attraction was found to 3-butenyl and 4-pentenyl isothiocyanate (NCS), but not to 2-phenylethyl isothiocyanate. A mixture of the three NCSs was more attractive than the individual NCSs. However, the concentration required to produce a response was still relatively high. Isothiocyanates, along with other volatiles from rape, probably play a role in host plant recognition by the seed weevil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02380783
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  • 2
    Electronic Resource
    Electronic Resource
    The influence of glucosinolates and sugars on feeding by the cabbage stem flea beetle,Psylliodes chrysocephala (1994)
    Springer
    Entomologia experimentalis et applicata 73 (1994), S. 77-83 
    Details
    ISSN: 1570-7458
    Keywords: Psylliodes chrysocephala ; cabbage stem flea beetle ; oilseed rape ; host plant selection ; glucosinolates ; surgars ; feeding stimulant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Agar was used as an artificial substrate to investigate the feeding behaviour of the cabbage stem flea beetle,Psylliodes chrysocephala L. (Coleoptera: Chrysomelidae), an important pest of winter oilseed rape (Brassica napus) in Europe. Both glucosinolates and sugars stimulated feeding when added to agar. The amount of feeding that occurred was affected by the type and concentration of glucosinolate and surgar and also by combinations of components. Although glucosinolates were potent feeding stimulants forP. chrysocephala, they were not a prerequisite for feeding, nor does it seem likely that glucosinolate profiles are used by this species to discriminate amongst cruciferous plants at the gustatory level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02382516
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  • 3
    Electronic Resource
    Electronic Resource
    The responses of the cabbage seed weevil Ceutorhynchus assimilis to volatile compounds from oilseed rape in a linear track olfactometer (1997)
    Springer
    Entomologia experimentalis et applicata 85 (1997), S. 257-262 
    Details
    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
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  • 4
    Electronic Resource
    Electronic Resource
    Optimization of Pheromone Dispensers for Diamondback Moth Plutella xylostella (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 2145-2159 
    Details
    ISSN: 1573-1561
    Keywords: Lepidoptera ; Plutellidae ; (Z)-11-hexadecenyl acetate ; (Z)-11-hexadecenal ; Plutella xylostella L. ; diamondback moth ; sex pheromone ; dispenser ; cabbage ; pheromone evaporation rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract We have investigated the effects of pheromone dispenser design, pheromone release rate, and the products of Z11–16:Ald decomposition on the attractiveness of the pheromone blend (Z)-11-hexadecenyl acetate, (Z)-11-hexadecenal, and (Z)-11-hexadecen-1-ol) in traps to Plutella xylostella males. Rubber minidispensers (K-50) were shown to have an active exposure time of at least two months and in delta traps to be capable of monitoring a population of P. xylostella throughout the summer in Estonia. Pheromone release rates between 8 and 17 ng/hr are recommended for maximum trap catches. The attractive blend contained 15–35% of Z11–16:Ac. Decomposition products of Z11–16:Ald inhibited the activity of the pheromone blend when more than 50% of the aldehyde had decomposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOEC.0000006435.13481.ba
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