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- Publisher
- Wiley
- Copyright
- 1988 Blackwell Verlag GmbH
- ISSN
- 0931-2048
- eISSN
- 1439-0418
- DOI
- 10.1111/j.1439-0418.1988.tb00561.x
- Publisher site
- See Article on Publisher Site
Abstract
The buprestid beetle Sphenoptera jugoslavica is the third insect established in Canada as a potential biological control for diffuse knapweed, Centaurea diffusa. The beetle population at the release site in British Columbia was monitored, and experiments were conducted to determine the beetle's effects on its host. S. jugoslavica reduces the survivorship of seedlings and rosettes, delays reproduction, and finally reduces seed output. Under favorable conditions the beetle can contribute to a significant reduction in knapweed population growth. Its effectiveness at the release site is limited by a phenological requirement for arrested plant growth during the oviposition period which leads to large fluctuations in the size of the beetle population, and only intermittent damage to the knapweed population. Zusammenfassung Zum Einfluß von Sphenoptera jugoslavica Obenb. (Col., Buprestidae) auf seine Wirtspflanze, Centaurea diffusa Lam. (Compositae) Der Käfer Sphenoptera jugoslavica ist die dritte Insektenart, die in Kanada eingeführt wurde, um die weitere Ausbreitung des ursprünglich südeuropäischen Weideunkrauts Centaurea diffusa in West‐kanada und Teilen der USA zu verhindern. Nach der 1976 erfolgten Aussetzung in British Columbia erfaßten wir den Bestand der Käfer bis zur Gegenwart. Von 1982 bis 1985 wurden Experimente durchgeführt, um den Einfluß auf die Centaurea‐Population abzuklären. S. jugoslavica verringert die Überlebenswahrscheinlichkeit von Keimlingen und Rosetten, verzögert die Fortpflanzung und reduziert schließlich die Samenproduktion. Unter günstigen Bedingungen kann der Käfer einen bedeutenden Beitrag zur Hemmung des Wachstums der Centaurea‐Population leisten. Allerdings ist der Schwächungseffekt am Aussetzungsort begrenzt. Die Käfer sind zur erfolgreichen Eiablage und Frühentwicklung auf ein momentan unterdrücktes Pflanzenwachstum angewiesen, das witterungs‐abhängig ist und deshalb zu großen Bestandsschwankungen der Käferpopulation führt.
Journal
Journal of Applied Entomology – Wiley
Published: Jan 12, 1988