The effect of juvenoids on aphids' natural enemies The effect of three juvenoids on Syrphus corollae, Chrysopa carnea and Coccinella septempunctata was tested with concentrations of 0,001, 0,01 and 0,1%. The application of CGA 13353 had no negative effect on the natural enemies. After the use of epophenonane (RO 10–3108), a mortality of up to 8% was observed. The mortality of the beneficial insects after application of kinoprene (ZR 777) ranged from 2 to 100%, depending on the stage of development. Zusammenfassung Drei Juvenoide wurden auf ihre Wirkung auf Syrphus corollae, Chrysopa carnea und Coccinella septempunctata in Konzentrationsstufen von 0,001%, 0,01% und 0,1% getestet Die Applikation von CGA 13353 führte zu keiner negativen Beeinflussung der Nützlinge. Nach der Anwendung von Epophenonane (RO 10–3108) wurde bei den Nützlingen eine Mortalität bei zu 8% beobachtet. Die Mortalität der Nützlinge nach Applikation von Kinoprene (ZR 777) reichte, je nach dem Entwicklungsstadium, von 2–100%. Anschrift des Verfassers: Dr. M. O. Nasseh, Institut für Phytopathologie und angewandte Zoologie, Ludwigstr. 23, D‐6300 Gießen
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