Masting of rowan <Emphasis Type="Italic">Sorbus aucuparia</Emphasis> L. and consequences for the apple fruit moth <Emphasis Type="Italic">Argyresthia conjugella</Emphasis> Zeller |
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Authors: | Sverre Kobro Linda Søreide Endre Djønne Trond Rafoss Gunnhild Jaastad Peter Witzgall |
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Institution: | 1. The Norwegian Crop Research Institute, Plant Protection Centre, N-1432 Ås, Norway, Tel. +47 64 94 92 95;2. Fax +47 64 94 92 26, e-mail: sverre.kobro@planteforsk.no, NO;3. Sandnes, Norway, NO;4. Vallavik, Norway, NO;5. The Norwegian Crop Research Institute, Ullensvang Research Centre, Lofthus, Norway, NO;6. Department of Crop Science, Swedish University of Agricultural Sciences, Alnarp, Sweden, SE |
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Abstract: | Masting of rowan Sorbus aucuparia L. has been studied in 45 sites in southern Norway for 22 years. We present data on the year-to-year variation in fruit setting
of rowan, and show that masting is spatially synchronous in Norway and probably all over Fennoscandia. The apple fruit moth
Argyresthia conjugella Zeller is an important seed predator on rowan. We present data on the abundance of apple fruit moth in rowanberries during
these years and discuss the consequences of masting and intermasting of rowan for apple fruit moth as a pest of apple. We
conclude that growth and climate have little impact on flowering intensity and suggest that masting of rowan is an adaptive
defense against seed predation and a new example of predator satiation: intermast years inhibit predators and prepare the
rowan for the subsequent mast.
Received: September 3, 2001 / Accepted: February 24, 2003 |
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Keywords: | Population fluctuation Synchrony Growth Climate Seed predation Extended diapause |
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