17
TABLE 3: Current Estimated Street Tree Population All ranges represent 80% confidence intervals (rounded to 3 significant figures)
WAKE FOREST TOWN ROADS
NCDOT STATE ROADS
TOTAL
Publicly Maintained Trees
14,200 (±2,370)
474 (±202)
14,700
95 (±25)
413
Privately Maintained Trees in ROW
318 (±111)
24 (±20) 71 (±39) 213 (±95)
199
Stumps
175 (±65) 48 (±33)
119
Dead Trees
5,400
Potential Planting Spaces
5,190 (±830)
876 (±218)
20,800
Total Planting Spaces
19,900 (±2,530)
Species
The 10/20/30 Rule Each tree’s strengths, weaknesses, needs, and benefits are determined largely by its species. In order to reduce the threat and spread of devastating pests and diseases, such as those that decimated the American elm and the American chestnut, it is important to plant a variety of different species. It is generally recommended that no more than 10% of a town’s street trees be of the same species, no more than 20% of the same genus, and no more than 30% of the same family. Following this 10/20/30 rule will help to ensure that pests and diseases are isolated and controllable, and have little impact on the total value of the urban forest. According to the 10/20/30 rule, Wake Forest has too many oaks, red and Freeman maples, and crapemyrtles (Table 4). Recommendations for alternatives to commonly planted species are provided in Table 5.
Oaks In Wake Forest, one in four street trees is a member of the red oak group. This group contains the very popular willow oak, as well as Shumard, Nutall, pin, water, north- ern red, southern red, black, and other oaks. The white oak group, which includes the white, post, chestnut, and other oaks,
Oaks in the red oak group have lobed, pointed leaves originating on alternating sides of the stem.
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