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Ceratocystis fagacearum (Bretz) Hunt), currently threatens the health of Quercus species in the United States.
Decoupling of tree growth from climate has been detected in other woodland systems (Wyckoff and Bowers, 2010), and is an important finding which will require further study with possible mechanisms including decreased tree vigor related to sampling mostly dead trees, increased competition from Ashe's juniper (Diamond, 1997), increased surface ozone concentration from Austin, TX, automobile traffic (Felzer et al., 2007), and widespread outbreak of the oak fungal phytopathogen Ceratocystis fagacearum in 1975 (Appel, 1995).
Oak wilt is caused by a fungus called Ceratocystis fagacearum. Many oaks are resistant, but live oaks (Quercus fusiformis and Q.
In addition, the WDNR and Wisconsin Council on Forestry (WCOF; 2016) recommend that stands with at least 15 ft2 acr[e.sup.-1] of oak (Quercus spp.) basal area not be harvested between early to mid-April and July 15 to avoid spread of oak wilt (Ceratocystis fagacearum Bretz), a fungal disease affecting oak species.