Studies on Norwegian Aphids - Norsk entomologisk forening

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Infestation Density of Trypodendron lineaturn (Olivier) (Coleoptera: Scolytidae) in Relation to Felling Date of Logs ERIK CHRISTIANSEN & TORFINN SlETHER Norwegian Forest Research Institute, Vollebekk, Norway Abstract: CHRISTIANSEN, E. & StETHER, T. 1968. Infestation Density of Trypodendron lineatum (Olivier) (Coleoptera: Scolytidae) in Relation to Felling Date of Logs. Norsk ent. Tidsskr. 15,28-30. Picea abies logs cut from October through March were attacked by the ambrosia beetle, Trypodendron lineatum, the infestation being heaviest in timber felled during the first part of the period. Logs cut in April, May, and June remained undamaged. INTRODUCTION Logs of a great number of conifers are attacked by the ambrosia beetle, Trypodendron lineatum (Olivier) when stored unbarked in the forest during spring and summer. Publications from several countries, in dealing with this damage, point out that the timber felling date influences the extent of attack (Tragardh 1921, Hadorn 1933, Morley 1939, Johnson 1958, Bletchly 1961, Bevan 1962, Bletchly & White 1962, Dyer & Chapman 1965). Generally, the greatest damage occurs in logs cut during autumn and winter, whereas attacks on those felled in spring are less extensive. In 1963-64 an investigation was carried out by Austara and S
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