Leptographium wageneri
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Source: USDA Forest Service - IPM Images
Leptographium wageneri (W.B. Kendr. 1962) M.J. Wingf. 1985
This fungus is found in in western North America, where it causes the black-stain root disease on pines (Leptographium wageneri var. ponderosum), Douglas fir (Leptographium wageneri var. pseudotsugae), and other conifers. Among the pine species, Jeffrey pine (Pinus jeffreyi) and ponderosa pine (P. ponderosa) frequently become infected. Infections result in yellow foliage, defoliation, and tree mortality. Over a 10 year period, mortality rates can reach and exceed 50% for seriously infected trees (Jacobi et al., 2008). Bark beetles like Dendroctonus valens are being suspected of being involved in the spread of the disease (Owen et al., 2005).
Synonyms:
Ceratocystis wageneri
Grosmannia wageneri
Ophiostoma wageneri
Verticicladiella wageneri
- Other images of Leptographium wageneri (Wikimedia Commons and IPM Images - click to enlarge)
symptoms on trunk of Pinus ponderosa
symptoms on trunk of Pinus edulis
infested Pinus edulis
