Mitteilungen der deutschen Gesellschaft für allgemeine und angewandte Entomologie (2001) 13, 273-278

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Inga Mewis, Christian Ulrichs and Wilfried H. Schnitzler (2001)
Fraßverhalten sowie Wirtsfindung des Südeuropäischen Kruziferenzünslers: Hellula undalis (Fabricius) (Lepidoptera: Pyralidae) im Kontext zu sekundären Inhaltsstoffen der Wirtspflanze
[Feeding behaviour and host-plant finding of the cabbage webworm, Hellula undalis (Fabricius) (Lepidoptera: Pyralidae) in the context of secondary host-plant compounds]
Mitteilungen der deutschen Gesellschaft für allgemeine und angewandte Entomologie 13, 273-278
Abstract: The possible role of glucosinolates (GS) and their hydrolysis products as feeding stimulants as well as attractants in host-plant-finding in the cruciferous pest, Hellula undalis (Fabricius) was examined. First instar larvae migrated on the host-plant Brassica campestris L. ssp. chinensis var. Black Behi from leaves to the growing point beginning on day two. Least preferred among plant parts for feeding were petioles, followed by leaves. Chemical analysis of secondary plant compounds from plant parts of B. chinensis showed the highest glucosinolate content in the growing point followed by leaves and petioles. Application of 10-4 M sinigrin (GS) to leaves influenced significantly the migration of early instars. Larvae fed longer on treated than on untreated leaves and only few moved to the growing point of treated plants. Furthermore, treatment with 10-4 M sinigrin stimulated H. undalis larvae to feed on the non-host-plant Vigna sesquipedalis.
H. undalis females, but not males, were attracted by host-plant odour in Y-olfactometer bioassays. Low concentrations of the GS hydrolysis products, allyl-isothiocyanate and benzyl-isothiocyanate, induced anemotaxis in adults in the Y-olfactomteter, but a high concentration of allyl-isothiocyanat was repellent. Oviposition by H. undalis females was not stimulated by host-plant volatiles. Females laid eggs in traps of the Y-tube regardless of presence or absence of host-plant odour.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: German)
Database assignments for author(s): Christian Ulrichs

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Hellula undalis Brassica - other species
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