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Host selection and antifeedants in Hylobius abietis pine weevils

Månsson, Per E. (2005). Host selection and antifeedants in Hylobius abietis pine weevils. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2005:16
ISBN 91-576-7015-3
[Doctoral thesis]

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We searched for antifeedant activity in predominantly 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 was tested in an assay where the insects are let to feed on the bark on a short stump of wood. Among the best candidates was linden (Tilia cordata). The bark was extracted and fractioned. Two fractions showed antifeedant activity in a micro feeding assay. Nonanoic acid was identified in both of these fractions. Subsequent testing in the micro feeding assay showed that nonanoic acid possessed strong antifeedant activity against H. abietis adults. Structure-activity and possible formulations for field application of nonanoic acid was investigated in laboratory and field by variation of the nonanoic acid molecular theme. Alkanoic acids of varying chain length from C6 to C13 and corresponding branched acids methyl-substituted in 2-position was tested. Derivatives of higher and lower volatility, restricted to straight chain C9, included 1-nonanol, nonanal, sodium nonanoate, and nonanoic anhydride were also tested. The C7 to C10 chain-length straight-chain acids were all active. Branched acids were active at +1 C higher molecular mass. Phytotoxic side effects occurred when nonanoic acid was tested in field, but an inactive wax layer, applied on the stem before the formulation, reduced the side effects. Bark extract from ten different tree species, which were earlier identified as non-preferred by the pine weevil were tested. One active extract was further fractionated. The content of active and inactive extracts was investigated by GC-MS.

Authors/Creators:Månsson, Per E.
Title:Host selection and antifeedants in Hylobius abietis pine weevils
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2005
Number of Pages:33
ALLI. Månsson, P. E., and Schlyter, F. 2004. Hylobius pine weevils adult host selection and antifeedants: feeding behaviour on host and non-host woody Scandinavian plants. Agric. Forest Entomol. 6: 165-171. II. Månsson, P. E., Eriksson, C., and Sjödin, K. 2005. Antifeedants against Hylobius abietis Pine Weevils: An active compound in extract from bark of Tilia cordata Linden. J. Chem. Ecol. 31: 000-000 (In print). III. Månsson, Per E., Schlyter, F., Eriksson, C., 2005. Structure-activity and field performance of nonanoic acid and other long-chained carboxylic acids as antifeedants in Hylobius abietis pine weevils. Manuscript for Entomologia Experimentalis & Applicata. IV. Eriksson, C., Månsson, P. E., Sjödin, K and Schlyter, F. 2005. Aliphatic acids and other antifeedants in non-host woody species of the pine weevil, Hylobius abietis. Manuscript
Place of Publication:Alnarp
ISBN for printed version:91-576-7015-3
Publication Type:Doctoral 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, picea abies, pinus sylvestris, tilia cordata, antifeedants, seedlings, damage, bark, organic acids, feeding habits
Keywords:feeding deterrent, Hylobius abietis, Picea abies, Pinus sylvestris, outer bark, phloem, pine weevil, seedling damage, Antifeedant, Curculionidae, Coleoptera, deterrent, extract, fractionation, linden, pelargonic acid, phloem, soxhlet, Tilia cordata, structure activity, formulation, capric, heptanoic, pelargonic, octanoic, nonanoic, decanoic acid
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ID Code:759
Department:(NL, NJ) > Institutionen för växtvetenskap
Deposited By: Staff Epsilon
Deposited On:10 Feb 2005 00:00
Metadata Last Modified:02 Dec 2014 10:07

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