Effect of bisabolangelone on development ofCydia pomonella larvae and oviposition of the females |
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Authors: | Cyrus Abivardi and Georg Benz |
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Institution: | (1) Department of Entomology, Swiss Federal Institute of Technology, CH-8092 Zurich, Switzerland;(2) Present address: Department of Plant Sciences (Applied Entomology), Swiss Federal Institute of Technology, CH-8092 Zurich, Switzerland |
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Abstract: | The effects of bisabolangelone on the development of codling moth larvae,Cydia pomonella L., and on ovipositional behaviour of the females were studied under laboratory conditions. Entry of the neonate larvae into
apples and their development on a semi-synthetic medium were completely inhibited when the larvae were exposed respectively
to 10 μg a.i./cm2 and 20 μg a.i./ml of this compound. While concentrations of 1.25 to 5.0 μg a.i./ml bisabolangelone in the medium did not
significantly affect larval development, exposure of the larvae to a higher rate (10 μg a.i./ml) resulted in 80% mortality
during the first week. Nevertheless, the larvae which survived the treatments underwent further development until emergence
of the adults. No significant changes in duration of larval or pupal periods were recorded.
Oviposition of the females in plastic beakers, whose inner surfaces were partially painted with two concentrations of bisabolangelone
(1.25 to 5.0 μg a.i./cm2), was significantly reduced and the eggs were mainly laid on the parts painted with the ethanol solvent alone. When the inner
surface of the cups was completely treated (i.e. top, bottom, and side) with similar concentrations of bisabolangelone, a
dramatic reduction in oviposition occurred and the eggs were mostly laid on the bottom of the beakers. While this compound
did not significantly influence egg hatch, it inhibited the normal upward movement of the adults in the cups and migration
of the newly hatched larvae through perforations of the lids. |
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Keywords: | bisabolangelone Angelica sylvestris sesquiterpenoids antifeedants codling moth Cydia pomonella larval development mortality penetration egg hatch |
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