Dryocetes autographus (Ratz.)From: Kolk A., Starzyk J. R., 1996: The Atlas of Forest Insect Pests Occurrence: Europe, the northern Asia to Korea and Japan. Host plants: The Scots pine and Norway spruce, sporadically other conifers. Morphology: Adults are 3-4 mm long, brown or reddish-brown, covered with sparse long yellowish setae. There are large punctures with a visible bottom on elytral declivity. Biology: Adults emerge in May through June. Females construct usually one-armed (sporadically 2- or 3-armed) egg galleries of 4-8 cm in length and 2 mm in width in the bark. They are only slightly visible in the wood. Eggs are laid in clusters. Sometimes females use current egg galleries of other species like Hylurgops palliatus or H. glabratus. Larval galleries are constructed only in phloem. Pupation occurs in oval pupal chambers in the sapwood. Larvae or adults overwinter in galleries. This species has one generation per 1 or 2 years. Occasionally the sister generation may occur. Damage: It is a secondary pest of low economic importance, because it infests mostly fallen dead trees. This species prefers shaded sites. It sometime is abundant in weakened dense stands, where occurs in the association with other species. Prophylactic measures and control: Removal of weakened trees, windthrows etc. Debarking of stored timber is recommended.
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Forest Pests: Insects, Diseases & Other Damage Agents |
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