TY - JOUR T1 - Frequency, Severity, and Detectability of Internal Trunk Decay of Street Tree <em>Quercus</em> spp. in Tampa, Florida, U.S. JF - Arboriculture &amp; Urban Forestry (AUF) SP - 217 LP - 226 DO - 10.48044/jauf.2016.020 VL - 42 IS - 4 AU - Andrew K. Koeser AU - Drew C. McLean AU - Gitta Hasing AU - R. Bruce Allison Y1 - 2016/07/01 UR - http://auf.isa-arbor.com/content/42/4/217.abstract N2 - Wood decay is a factor considered in all commonly accepted tree risk assessment methods; however, few studies have attempted to assess its presence in the urban forest or its predictability given visual cues and site factors. A random sampling of trees situated on hurricane evacuation routes was inventoried and assessed for risk in the city of Tampa, Florida, U.S. In addition to a basic visual assessment, a sampling of larger diameter (&gt;30.5 cm) live oak (Quercus virginiana) and all large diameter laurel oak (Quercus laurifolia) trees were tested with a resistance-recording drill to determine the amount of decay present (looking specifically at the sound-wood-to-stem-diameter ratio). Overall, 56.9% of the trees tested had some level of decay, though the incidence of decay was higher in laurel oak (67.4%) than in the live oak (29.4%). Additionally, tree species (P &lt; 0.01), diameter (P &lt; 0.01), and the presence or absence of visual decay indicators (P = 0.03) were all significant predictors of decay presence. ER -