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Sirex Woodwasp
Identifying Characteristics:• 1 – 1 ½” long• Do not have narrow waists like
many wasps• Metallic blue-black color• Females have orange legs• Males have orange in abdomen
and black hind legs
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Sirex WoodwaspRelationship between Fungus and Wasp
Wasp injects toxic mucus + fungus into tree while depositing
eggs
Mucus kills tree cells and fungus eats dead
cells
Wasp eggs hatch and larvae feed on fungus
Mature wasp exits tree and carries mucus and fungus to
another tree
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Sirex WoodwaspCommon Host Trees
White PineScots Pine
• North American Pines
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Sirex WoodwaspMap – Range of Sirex Woodwasp
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Sirex WoodwaspWhat to Look For
1. Small, round exit holes
2. Heavy needle fall and wilting
3. Progressive color changes at the top of the tree
4. Resin from egg-laying on branch and trunk
5. Brown fungal staining of sap wood1 2
3 4 5
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Sirex WoodwaspWhat to Look For
1. Small, round exit holes
2. Heavy needle fall and wilting
3. Progressive color changes at the top of the tree
4. Resin from egg-laying on branch and trunk
5. Brown fungal staining of sap wood1 2
3 4 5
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Sirex WoodwaspWhat to Look For
1. Small, round exit holes
2. Heavy needle fall and wilting
3. Progressive color changes at the top of the tree
4. Resin from egg-laying on branch and trunk
5. Brown fungal staining of sap wood1 2
3 4 5
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Sirex WoodwaspWhat to Look For
1. Small, round exit holes
2. Heavy needle fall and wilting
3. Progressive color changes at the top of the tree
4. Resin from egg-laying on branch and trunk
5. Brown fungal staining of sap wood1 2
3 4 5
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Sirex WoodwaspWhat to Look For
1. Small, round exit holes
2. Heavy needle fall and wilting
3. Progressive color changes at the top of the tree
4. Resin from egg-laying on branch and trunk
5. Brown fungal staining of sap wood1 2
3 4 5
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YEAR-ROUND: Heavy needle fall or wilting; Small, round exit holes.
LATE FALL/EARLY WINTER:
Attacked trees have pale green, yellow or red needles at the top.
LATE SUMMER/EARLY FALL:
Flight time for adults begins.
Sirex WoodwaspWhat to Look For (cont.)
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Sirex WoodwaspAdditional Resources
USDAhttp://www.na.fs.fed.us/spfo/pubs/pest_al/sirex_woodwasp/sirex_woodwasp.htm
Don’t Move Firewoodhttp://www.dontmovefirewood.org/gallery-of-pests/woodwasp.html
EDDMaps: Reporting App for Smartphoneshttp://www.eddmaps.org/