Hispidus Canker
From Bugwoodwiki
Polyporus hispidus (Bull.) Fr.
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Importance
Hispidus canker caused by P. hispidus, appears on willow oak, Nuttall oak, white oak, and hickory. Incidence of infestation varies by area and species, but may be as high as 13 percent. Cankers lengthen about 6 inches (15 cm) yearly. The decay column length exceeds the canker length. Diseased trees are quickly converted to culls.
Identifying the Fungus
Hispidus conks are about 2 to 12 inches (5 to 30 cm) wide, spongy, stalkless, yellowish-brown to red, with pores on the lower surface. Conks are produced during the summer or fall. They dry to a black mass and can usually be found around the base of infected trees.
Identifying the Injury
Hispidus cankers are large, elongate, sunken in the center and bordered by callus folds. Infected stems become spindle-shaped. A small branch stub may be found near the center where the infection started.
Biology
Microscopic spores are released from conks for a few weeks. They are spread by the wind, but most travel no more than 140 yards (128 m). Spores reaching dead branches on healthy trees start new infections. Conks will form after deadening or felling diseased trees.
Control
Cut hispidus-diseased trees as soon as possible for salvage and to reduce disease spread by limiting spore dissemination to healthy trees. No suitable treatment is known for high-value trees in urban areas.
References
J. D. Solomon, F. I. McCracken, R. L. Anderson, R. Lewis, Jr., F.L. Oliveria, T.H. Filer, and P.J. Barry
