Pine longhorn beetle - Asemum striatum (L.)From: Kolk A., Starzyk J. R., 1996: The Atlas of Forest Insect Pests Occurrence: Common in Europe, Siberia, Korea, Mongolia, Japan and Sakhalin Island. Host plants: Conifers, mainly the Scots pine, sporadically the Norway spruce and larch. Morphology: Adults are 8-25 mm long. Males are usually smaller than females. The body is robust, dull. Elytrae are black, brown or reddish, densely punctured, with 2-4 parallel ridges. The 5th segment of male antennae is longer than the third one. Females have those segments of the same length. The egg is white, elongated, 1.2-1.4x0.4-0.5 mm in size. The larva is white, up to 38 mm long. At the end of 9th segment there are two characteristic spines (urogomphi). Their height is equal to the distance between them. The pupa is 18-20 mm long. Biology: Adults active during the daytime from May through July. Adults do not have maturation feeding. Females oviposit in clusters with several eggs per cluster into thick bark crevices. First, larvae feed under the bark, then in the wood. They excavating oval tunnels up to 8 mm wide, filled with pressed shredded wood and bark. Galleries are very similar to those of A. rusticus, but in the former case galleries in the wood are more narrow, and exit wholes of adults are less flattened. Fully-developed larvae construct pupal chamber and chew exit holes of 5x3 mm in size. This species has one generation per one up to three years, depending on a moisture of the breeding material. Damage: It is a technical pest infesting mainly the basal part of tree stems up to 3-4 meters. A. striatum prefers mostly stumps, but also trees damaged by fire or wind, weakened or dying trees, etc. Preventive measures and control: Similar to A. rusticus.
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Forest Pests: Insects, Diseases & Other Damage Agents |
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