Insects Index
Asian Longhorned Beetle
Anoplophora glabripennis
Elm Zigzag Sawfly
Aproceros leucopoda
Emerald Ash Borer
Agrilus planipennis
Fall Cankerworm
Alsophila pometaria
Forest Tent Caterpillar
Malacosoma disstria
Hemlock Woolly Adelgid
Adelges tsugae
Ips Bark Beetles
Ips spp.
Sirex Woodwasp
Sirex noctilio
Southern Pine Beetle
Dendroctonus frontalis
Spongy Moth
Lymantria dispar
Spotted Lanternfly
Lycorma delicatula
Steven Valley, Oregon Department of Agriculture,

Invasive Woodwasp, Sirex noctilio: A Potential Pest of Pines in Arkansas

University of Arkansas
J.D. Hopkins et al.
Sirex noctilio, the Sirex woodwasp, is native to Europe, Asia, and northern Africa. This insect was first found in North America in 2004, and current populations are confined to northeastern North America. Adult males are black with an orange stripe, while females are a dark blue. Both sexes have yellowish wings, and range from ½ - 1 ½” long. Eggs are laid in the tree’s xylem tissue, and larvae bore holes in the wood while feeding on fungus provided by the adult. Larvae can spend up to two years inside the tree. The Sirex woodwasp attacks conifers, especially scots, jack, loblolly, shortleaf, and slash pines. Resin dripping down the stem of a tree is one of the first signs of infestation, as are round (~¼”) exit holes. The Sirex woodwasp is not expanding its range quickly in North America, and it has yet to reach the southeastern U.S. Maintaining healthy basal area levels in your pine stands is an effective management tactic.
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