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Pine weevil Hylobius abietis feeding in shelterwood systems

Wallertz, Kristina (2005). Pine weevil Hylobius abietis feeding in shelterwood systems. Alnarp : Sveriges lantbruksuniv.
ISBN 91-576-6875-2
[Licentiate thesis]

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Damage caused by the pine weevil, Hylobius abietis (L.) (Coleoptera, Curculionidae) feeding on conifer seedlings is a major problem in reforested areas in many parts of Europe. The adult pine weevil feeds on the stem bark of young seedlings, frequently killing a large proportion of newly planted seedlings. Planting beneath a shelterwood has proved to reduce pine weevil damage on conifer seedlings, but the reasons for this are not yet fully understood. One suggestion that has been put forward is that the shelterwood provides alternative food sources, which are not present in clearcuts, for the weevils. The aims of the studies underlying this thesis were to investigate the possibility that additional food supplies could decrease damage to seedlings, to quantify pine weevil feeding on roots in the humus layer and to examine the possibility that increased feeding on roots in the shelterwood could explain the observed difference in feeding damage to planted seedlings. The effect of removing shelter trees on pine weevil damage to seedlings was examined in a survey study. Pine weevil damage on seedlings was significantly reduced when extra food (fresh branches of Scots pine) was regularly provided close to the seedling. The above ground part of natural field vegetation, mainly bilberry, did not reduce the damage to the same extent. Roots in the humus layer comprised an important food resource for the pine weevil and during the first year after cutting it was utilised to similar extents in both clearcuts and shelterwoods. Roots from other species, like bilberry, were less abundant but were also utilised by the pine weevil. After final cutting of shelter trees the area was invaded by immigrating pine weevils in the spring, which damaged the seedlings. Before shelter trees are cut Norway spruce and Scots pine seedlings should have reached diameters of at least 9 and 12 mm, respectively, in order to avoid lethal damage by pine weevil. Author’s address: Kristina Wallertz, Asa Forest Research Station, Swedish University of Agricultural Sciences, SE 360 30 Lammhult, Sweden, e-mail: Kristina.Wallertz@esf.slu.se

Authors/Creators:Wallertz, Kristina
Title:Pine weevil Hylobius abietis feeding in shelterwood systems
Year of publishing :December 2005
Number of Pages:19
ALLÖrlander, G., Nordlander, G. & Wallertz, K. 2001. Extra food supply decreases damage by the pine weevil Hylobius abietis. Scandinavian Journal of Forest research 16, 450-454. Wallertz, K., Nordlander, G. & Örlander,G. 2005. feeding on the roots in the humus layer by adult pine weevil, Hylobius abietis. Agricultural and Forest entomology. Submitted. Wallertz, K., Örlander, G. & Luoranen, J. 2005. Damage by pine weevil Hylobius abietis to conifer seedlings after shelterwood removal. Scandinavian Journal of Forest research 20, 412-420.
Place of Publication:Alnarp
ISBN for printed version:91-576-6875-2
Publication Type:Licentiate thesis
Full Text Status:Public
Agris subject categories.:H Protection of plants and stored products > H10 Pests of plants
Subjects:Not in use, please see Agris categories
Agrovoc terms:hylobius abietis, coniferales, seedlings, forest plantations, protective forests, regeneration, damage, feeding habits, root eating insects, forest pests
Keywords:Curculionidae, conifer seedling, feeding damage, Hylobius abietis, large pine weevil, reforestation, shelter trees, shelterwood.
Permanent URL:
ID Code:997
Department:(S) > Southern Swedish Forest Research Centre
Deposited By: kristina wallertz
Deposited On:06 Dec 2005 00:00
Metadata Last Modified:02 Dec 2014 10:08

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