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Hylobius pine weevils adult host selection and antifeedants: feeding behaviour on host and non-host woody scandinavian plants

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1 We searched for antifeedant activity in predomonantly non-host woody plants to find new compounds for seedling protection of Scots pine (Pinus sylvestris) and Norway spruce (Picea abies) against feeding by pine weevil Hylobius abietis. In total, 38 species from 25 families were compared in choice and no-choice tests.

2 In choice tests with Empetrum, Juniperus, Ledum, Populus, Betula, Evonymus, Sorbus, Salix, Myrica and Pinus, the weevils preferred Pinus to all others. In no-choice tests with the same species, the insects removed a similar or even greater area of the bark in three of 10 species than Pinus. The results were clearly different between the test modes.

3 In experiment 4, the areas of outer and inner bark (phloem) removed were quantified separately.The weevils removed significantly less of both outer and inner bark in Ilex, Evonymus, Populus, Syringa, Taxus, Tilia, Viburnum, Lonicera and Sorbus than Pinus.

4 Large areas of outer bark were removed in Juglans, Fraxinus, Sambucus, Aesculus, Quercus, Corylus, Fagus, Salix, Alnus and Acer. However, in the latter cases the insects stopped when reaching the inner bark. Thus, certain plant species have the outer bark removed by the insects but possessed an inner bark with antifeedant qualities.
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Keywords: Antifeedant; Curculionidae; Hylobius abietis; feeding deterrent; non-host plant; outer bark; phloem; pine weevil; seedling damage

Document Type: Research Article

Affiliations: Chemical Ecology, Department of Crop Sciences, Swedish University of Agricultural Sciences, PO Box 44, SE-230 53 Alnarp, Sweden

Publication date: 2004-05-01

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