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Movement behaviour and resource tracking in the pine weevil Hylobius abietis

Björklund, Niklas (2004). Movement behaviour and resource tracking in the pine weevil Hylobius abietis. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Silvestria, 1401-6230 ; 302
ISBN 91-576-6536-2
[Doctoral thesis]

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The pine weevil Hylobius abietis (L.) (Coleoptera, Curculionidae) is, economically, the most important forest pest over large areas of Europe. The adults feed on the stem bark of newly planted conifer seedlings, causing severe damage and mortality. The aim of this thesis was to obtain knowledge about behaviours of the pine weevil associated with its feeding, which may be of use in designing measures to protect seedlings. A field experiment showed that the pine weevils use both olfaction and vision to find conifer seedlings. Their response to the combination of odour and visual stimuli were additive. Visual stimuli were at least as important as odour in finding an undamaged conifer seedling. Soil scarification, which usually exposes mineral soil, is widely used in Scandinavian forest regeneration. In a field experiment, half as many seedlings on mineral soil were attacked by weevils as on undisturbed humus. However, somewhat more weevils approached seedlings surrounded by mineral soil than by humus. It is concluded that the surrounding soil type strongly influences whether a pine weevil decides to feed on a seedling, and that this decision is taken in close proximity to the seedling. Another field experiment showed that feeding was less common on mounds of sand than on flat sand surfaces, but that there was more feeding in sandy pits. This effect of sandy slopes is attributed to the observed difficulty for the weevils to climb these slopes. Many insects spend a large proportion of their life inactive, hiding in shelters. The presence of shelters may, therefore, influence where insects feed. Laboratory experiments demonstrated that the pine weevils were highly attracted to shelters both above and below ground. Visual stimuli were used for orientation towards shelters. Visual stimuli also increased the probability of an individual remaining for a long period in a shelter. The presence of wind increased the weevils’ propensity to use shelters both above and below ground. The results of this thesis highlight the importance of planting seedlings in mineral soil, preferably on mounds, and of avoiding planting locations where the weevils can use above or below ground shelters in the vicinity of seedlings.

Authors/Creators:Björklund, Niklas
Title:Movement behaviour and resource tracking in the pine weevil Hylobius abietis
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Silvestria
Year of publishing :May 2004
Number of Pages:17
ALLI. Björklund, N., Nordlander, G. & Bylund, H. Olfactory and visual stimuli used in orientation to conifer seedlings by the pine weevil Hylobius abietis. Manuscript. II. Nordlander, G., Bylund, H. & Björklund, N. Soil type and ground topography influencing feeding above and below ground by the pine weevil Hylobius abietis. Manuscript. III. Björklund, N., Nordlander, G. & Bylund, H. (2003) Host-plant acceptance on mineral soil and humus by the pine weevil Hylobius abietis (L.). Agricultural and Forest Entomology, 5, 61-65. IV. Björklund, N. Cues for shelter use in a phytophagous insect. Manuscript.
Place of Publication:Uppsala
ISBN for printed version:91-576-6536-2
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, feeding habits, seedlings, forest plantations, damage, coniferales, pest insects
Keywords:Host plant acceptance, host volatiles, mounding, olfactory orientation, pitfall trap, reforestation, seedling damage, soil type, underground feeding, visual orientation
Permanent URL:
ID Code:551
Department:(NL, NJ) > Dept. of Entomology (until 061231)
Deposited By: niklas björklund
Deposited On:04 May 2004 00:00
Metadata Last Modified:02 Dec 2014 10:05

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