Mini-seedlings of Picea abies are less attacked by Hylobius abietis than conventional ones

is plant chemistry the explanation?

Document identifier: oai:dalea.du.se:2544
Access full text here:10.1080/02827580802203560
Keyword: Agricultural Sciences, Agricultural Science, Forestry and Fisheries, Wood Science, Lantbruksvetenskaper, Lantbruksvetenskap, skogsbruk och fiske, Trävetenskap, Green leaf volatiles; growth; Hylobius abietis; Picea abies; seedling size; survival; terpenes; weevil damage
Publication year: 2008
Abstract:

The pine weevil, Hylobius abietis (L.), is a major pest in conifer reforestation areas in the Palaearctic region. Size and chemistry of the seedlings may explain the damage rates in plantations. The performance of 10-week containerized seedlings (mini-seedlings) was compared with 1-year-old conventional seedlings of Norway spruce, Picea abies (L.), in a field experiment in central Sweden. After 2 years the weevil damage was lower for the mini-seedlings than for the conventional seedlings (3.5 vs 55%). After 3 years, the overall survival was 82 and 75%, respectively. Weevil damage was the main cause of mortality for conventional seedlings, whereas mini-seedlings mainly died from drought. Volatiles of the two seedling types were compared by solid-phase microextraction-gas chromatography-mass spectrometry (SPME-GC-MS). Unwounded mini-seedlings and conventional seedlings differed in their compositions of monoterpenes and sesquiterpenes. Mini-seedlings mainly emitted limonene, known to be repellent to the pine weevil. When wounded, green leaf volatiles were released by mini-seedlings while the pine weevil attractant -pinene was released by conventional seedlings. Volatiles may partly explain the mini-seedlings' resistance against weevil attack. Further studies are needed to clarify how long this mini-seedling effect remains.

Authors

Marie Pettersson

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Astrid Kännaste

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Anders Lindström

Högskolan Dalarna; Skog- och träteknik
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Claes Hellqvist

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Eva Stattin

Högskolan Dalarna; Skog- och träteknik
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Bo Långström

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Anna-Karin Borg-Karlsson

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