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Research ArticleArticles

Attitudes of Residents Toward Street Trees on Four Streets in Toledo, Ohio, U.S. Before Removal of Ash Trees (Fraxinus spp.) from Emerald Ash Borer (Agrilus planipennis)

Joseph Heimlich, T. Davis Sydnor, Matthew Bumgardner and Patrick O’Brien
Arboriculture & Urban Forestry (AUF) January 2008, 34 (1) 47-53; DOI: https://doi.org/10.48044/jauf.2008.007
Joseph Heimlich
Joseph Heimlich, Professor of Environmental Education, School of Environment and Natural Resources, The Ohio State University, 2021 Coffey Road, Columbus, OH 43210, U.S.
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T. Davis Sydnor
T. Davis Sydnor (corresponding author), Professor of Urban Forestry, School of Environment and Natural Resources, The Ohio State University, 2021 Coffey Road, Columbus, OH 43210, U.S.,
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  • For correspondence: [email protected]
Matthew Bumgardner
Matthew Bumgardner, Research Forest Products Technologist, USDA Forest Service, 359 Main Road, Delaware, OH 43015, U.S.
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Patrick O’Brien
Patrick O’Brien, Urban Forester, Forestry Division, City of Toledo, Toledo, OH 43607, U.S.
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Abstract

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Toledo, Ohio, U.S. residents on four streets in an area with mature street trees, including ash, scheduled for removal as a result of attack by emerald ash borer were surveyed to determine their attitudes toward their street trees. Toledo is in the process of removing some 5,000 trees. Large trees with a variety of summer and fall foliar characteristics were highly valued suggesting that residents would be satisfied with a mix of species rather than planting each street to a single species. The fact that their trees canopied the street was also important to residents and is characteristic of larger urban trees. Residents would be pleased if replacements were planted before removing existing trees. Flowers were not a significant concern for residents. In Toledo, as it is in many communities, the primary maintenance concern regarding trees in this survey is the potential damage to sidewalks.

Key Words
  • Agrilus
  • ash replacements
  • community safety
  • emerald ash borer
  • Fraxinus spp
  • green ash
  • resident attitudes
  • street trees

Emerald ash borer (EAB) is a recently introduced exotic pest from Eastern Asia (Akiyama and Ohmomo 2000; Poland and McCullough 2006). The insect was first described in the Detroit, Michigan, U.S. area in 2002 (United States Department of Agriculture, Animal Plant Health Inspection Service 2003; Cappaert et al. 2005). Currently, these pests are found in Michigan, northwestern Ohio, and northeastern Indiana (Herms et al. 2004). These pests are in the order Buprestidae and are known as buprestids or metallic wood-boring beetles.

Emerald ash borer outlier populations have spread more rapidly than at first predicted (Cappaert et al. 2005; Iverson et al. 2006). Because the EAB is an exotic insect, there is no evolutionary history for this pest with the native North American ashes and thus the insect is very likely to kill its host. The latent period when the plants are asymptomatic has only recently been studied (Cappaert et al. 2005). Although plants decline and die rapidly on becoming symptomatic, failure to account for the latent period results in the appearance that the insect takes longer to kill its host than originally thought. This is a problem because early infestations are difficult to diagnose and several life cycles can be completed before a landowner might be expected to identify the threat. Currently, all of Toledo’s approximately 5,000 ash street trees are scheduled for removal. This task began in June 2006. Statewide, the total losses for removal and replacement could range from $1.8 to $7.8 billion in Ohio communities alone (Sydnor et al. 2007).

Researchers visited an area in Toledo, Ohio, in early June 2006 where trees were scheduled for removal approximately 1 month later as a result of an EAB infestation. A number of residents came out to check and see what was happening in their neighborhood. Several residents offered suggestions. One resident reminded us that the ash trees to be removed had been planted in response to the removal of elm trees in the 1950s. His question was “Don’t we ever learn?” It is interesting that Cheng and McBride (2006) noted that after the World War II devastation in Hiroshima and Tokyo, there was a tendency by the public to initially recreate what had been and to reject urban planning. It was clear that residents of Toledo had something to say. The city in turn wanted the residents to feel that their wishes were being heard and that the city was responsive. The survey was considered a good way to gain citizen input as has been demonstrated in other cities such as Sacramento (Sommer et al. 1989).

BACKGROUND

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A number of studies have been conducted to assess resident attitudes over the years in nearby states and provinces. Cultural backgrounds have been shown to result in differing attitudes toward trees (Fraser and Kenney 2000; Johnston and Shimada 2004; Schroeder et al. 2006). Schroeder et al. noted that Chinese, Portuguese, Italian, and U.K. residents had differing attitudes toward shade trees but preferred fewer or smaller trees. Hitchmough and Bonugli (1997) noted that Scottish residents also preferred smaller trees and further noted that females had stronger preferences for reduced plantings or smaller trees. This is in contrast with surveys of U.S. residents (Kalmbach and Kielbaso 1979; Schroeder and Cannon 1983; Sommer et al. 1989; Schroeder, and Ruffolo 1996; Schroeder et al. 2006) where larger trees were preferred.

Schroeder and Ruffolo (1996) noted that the single largest factor in determining the attractiveness of street scenes was the size of trees and that streets were especially attractive when larger trees canopied the street. In one study, virtually no one rated their trees as too small when asked whether their trees were too small or too large (Schroeder and Ruffolo 1996). This was true even when the individual had expressed a preference for smaller trees.

Interestingly, the preference for larger trees in an aesthetic sense is in keeping with studies maximizing ecological benefits of trees. Large trees delivered more benefits to include increased or improved shading, water quality, and air quality (McPherson 2005). Similarly, social benefits accrue to larger trees and grass in inner cities (Kuo 2001).

Communities have normally been planted with a single taxa on a given street. Would residents prefer to go back with single taxa or would residents tolerate or prefer a variety of street trees on their street? Additionally, there has been a tendency to plant medium to small street trees in recent years. Would residents prefer larger trees as replacements as recommended by McPherson (2005)? Studies have shown that “experts” and residents often have different ideas of what is desired or constitutes a desirable planting (Bonnes et al. 2004).

Thus, it was decided to determine what residents value about their neighborhood and trees before the removal of the ash trees. The intent was to use the information to assist communities in Ohio, especially Toledo, with ash replacement strategies.

MATERIALS AND METHODS

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Socioeconomic status has been demonstrated as a factor that affects attitudes toward street or park trees (Martin et al. 2004). Additionally, this was seen as a factor in the review by Bonnes et al. (2004). A site visit was made to view the Toledo area where 131 larger ash trees were infested with EAB and scheduled for removal. Four-block segments of four north–south streets were selected for study. The study area was an established, middle class area in northern Toledo dominated by single-family residences. In Toledo, larger ash trees were concentrated in neighborhood constructed between 1950 and 1965. These areas are relatively uniform in socioeconomic status. The sample area was not chosen randomly, but to assess impacts from EAB in an established neighborhood with larger trees. Thus, results should not be extrapolated to Toledo as a whole with its diverse areas such as commercial districts.

Streets were generally canopied by mature [less than 38 cm (15.2 in)] street trees in 1.2 to 1.8 m (3.96 to 5.94 ft) tree lawns. Two streets were selected because they were dominated by ash trees and the streetscape would be altered when the trees were removed, whereas two streets were dominated by other species in the tree lawns and would remain unchanged. The study area was not known to be dominated by any specific ethnic group; thus, ethnicity was not evaluated. Trees had been marked for removal and residents had been notified of their impending removal before the distribution of the survey. A mail survey was used to enable a larger percentage of residents to respond. The city mailed the survey forms so that the researchers would not be involved in selecting participants plus the city felt that this would be an expression that they were concerned about residents and their attitudes.

The survey instrument (Appendix 1) covered both sides of an 8.5 × 11 inch sheet of paper. A cover letter was prepared asking for citizen support and reminding them that their response was anonymous but that it might help other Ohioans because Toledo was the first of Ohio’s major communities hit by this newly introduced pest. The survey instrument was divided into one general area, and four subject areas covering feelings about the street or neighborhood, the trees on the street, assets of trees, and concerns about trees. Survey questions can be seen in Tables 1–4. Additionally, a summated mean was derived by averaging an individual’s responses to the various questions within a topic area. Ohio State’s Institutional Review Board approval was obtained for the study.

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Table 1.

Residents were questioned how important each of the reasons was to them in terms of how well they liked the street on which they lived.z

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Table 2.

Residents were questioned about the trees lining their street and asked how important these reasons were to them in determining the appeal of their street.z

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Table 3.

The following questions asked how residents might value the following characteristics of trees on their street.z

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Table 4.

Residents were questioned regarding their attitudes toward maintenance concerns associated with trees on their street.z

The Division of Forestry for Toledo addressed and mailed the survey instrument with the cover letter and a postage-paid, self-addressed envelope to all addresses in the city mailing list on the selected street segments. Completed surveys were returned directly to researchers at The Ohio State University for data entry and analysis.

Data were analyzed using SPSS+ 14.0 (SPSS Inc., Chicago, IL). Central tendencies were determined for all items and summated scales. Tests were run including t tests, analyses of variance (ANOVAs), and Cramer’s V for significance and relationship.

RESULTS AND DISCUSSION

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Respondents

Because the survey was administered by the city of Toledo, Ohio, the researchers do not have access to the frame and cannot therefore identify response rate. The city estimated that there were 384 addresses in the area surveyed, but this includes addresses for vacant lots, properties using cross streets as mailing addresses, and additional addresses for properties with more than one lot. The city received 89 questionnaires as undeliverable, whereas 113 usable survey instruments were returned. This would then account for at least 50% of the estimated 384 initial mailings by the city.

Fully 100% of the respondents owned their homes, so that variable was removed from further analysis. The median years living in the home was 11 and the mean was 16.4. This suggests that a resident’s average time in their home was similar to the 15-year national,16-year Ohio, and 18-year Toledo area averages for owner-occupied residences (J. Butler, U.S. Department of Commerce, U.S. Census Bureau, pers. comm.). A minority of the families (38%) have children under 18 years of age living at home. There were no statistically significant correlations between length of time in residence with any of the concerns about trees. Concerns are thus felt to be valid across ages and stages of life. Furthermore, the t test did not reveal any differences in tree concerns for households with children under 18 years of age.

Neighborhood Characteristics

Residents were asked what they liked about their street (Table 1). Respondents identified safety, cleanliness, attractiveness, and value of the houses as the things most important to liking their neighborhood. All items in the scale (with a reliability of 0.79), however, were rated highly with a summated mean for “liking the neighborhood” at 5.91. Table 1 is a chart identifying the responses to the various elements.

Not surprisingly, there was a significant relationship (using an ANOVA) between households with children under 18 and the amount of traffic (P = 0.0080) and a good area for children to play (P = 0.000). Feeling safe was also significantly correlated to the amount of traffic (r = 0.478) and being a good area for children to play (r = 0.232). Low traffic density reduces risk to children at play. Trees have been shown to be associated with reduced crime in some low-income communities (Kuo 2001). It was interesting but not surprising to see this concern expressed in this neighborhood as well.

Running a Cramers’ V, there were several items within the scales that did correlate significantly. The item of “knowing my neighbors” was slightly to moderately strongly correlated to all the variables related to street or neighborhood appreciation with the exceptions of value of the houses and attractiveness of the street. This was the item that had the lowest mean, median, and mode scores. Still, knowing neighbors is important in determining an individual’s feeling toward his or her neighborhood and interrelates with most other elements in determining how people view their neighborhood.

Overall, correlations among variables ranged from 0.014 (negligible) to 0.651 (strong). Style of homes was weakly to moderately correlated to proximity to necessities (r = 0.203, P = 0.031), value of the houses (r = 0.421, P = 0.000), attractiveness of the street (r = 0.262, P = 0.005), mature trees on the street (r = 0.264, P = 0.005), landscaping (r = 0.363, P = 0.000), and cleanliness of the street (r = 0.298, P = 0.001).

A separate item asked specifically “Overall, do you like the street you live on?” Responses ranged from 1 = not at all to 7 = very much. The mean was very strong at 6.19 with a deviation of 0.967. This item, however, was only significantly correlated with the summated mean of the above scale, “the neighbors” (r = 0.323. P = 0.001), and “knowing the neighbors” (r = 0.224, P = 0.019). These findings would suggest that when asked about specifics, individuals view different elements of why they like their streets as discreet elements and respond differently. Yet, overall, there is consistency in the composite response but no correlation in the individual score.

Interestingly, landscaping people have in front of their houses was more uniformly related to characteristics of street trees (Table 2): helping to make a neighborhood feel safe (0.187, P = 0.000), cooling the street/homes (0.386, P = 0.000), reducing wind (0.324, P = 0.000), tree canopies over the street (0.320, P = 0.000), larger-sized trees (0.410, P = 0.000), increased property values (0.483, P = 0.000), lower utility bills (0.331, P = 0.000), make the street prettier (0.503, P = 0.000), the same size (0.312, P = 0.000), and color in the fall (0.358, P = 0.000) were considered as being related to front yard landscaping.

Street Tree Characteristics

Respondents then were asked what they value about the trees on their street on a 13-item, 7-point Likert-type scale with a reliability of 0.86. Responses ranged from 1 = “doesn’t relate” to 7 = “major reason” (Table 2). Several items were viewed as near the midpoint: helping making the neighborhood feel safe, looking alike, being the same size, and being different. All other items were viewed positively with making the street prettier being the most strongly supported item followed closely by cooling the street and the homes and the way they stretch over the street.

In correlating the elements of what people think about the trees on their streets with characteristics of their neighborhood, several patterns emerge. Attractiveness of the street was moderately strongly and significantly related to mature trees on the street (r = 0.530, P = 0.000), landscaping people have in front of their houses (r = 0.573, P = 0.000), and cleanliness of the street (r = 0.566, P = 0.000). It is interesting to note that feelings about trees are influenced by larger issues related to the neighborhood.

Mature trees on the street were also significantly related to many desirable characteristics of trees. Shade that cools streets and homes (0.321, P = 0.000), the way trees stretch over the street (0.385, P = 0.000), and the large size of the trees (0.468, P = 0.000) are all characteristics of mature trees. Increased property values (0.442, P = 0.000) and lowering utility bills (0.375, P = 0.000) are also a function of maturity. Aesthetic characteristics such as making the street prettier (r = 0.391, P = 0.000), color in the fall (r = 0.290, P = 0.002), and the trees are the same size (r = 0.227, P = 0.016) were also correlated with maturity.

Street trees were neutrally associated with making the community feel safe despite research in Illinois that associates trees and grass with reduced domestic violence and fewer police calls (Kuo 2001). This particular community did not perceive a strong connection with this benefit of trees and this finding would beg further research in perceptions of safety (embedded like in this scale or explicit as a question).

Positive Individual Tree Characteristics

Respondents were asked 13 items about how much they valued specific elements of trees that might reveal those characteristics that might appeal in selecting replacement trees (Table 3). Responses on the 7-point Likert-type scale ranged from 1 = “not at all” to 7 = “completely.” This scale had a reliability of 0.89. From this scale, it becomes clear that there is less agreement on characteristics that influence a majority of homeowners. Clearly, fruit (large or showy and small or unimportant) were not desirable for most of the respondents with mean scores of 2.69 and 2.70 and medians of 3 and modes of 1. Several items were neutral in both median and mode (4): showy bark for winter (3.65), large leaves (4.11), and small leaves (3.80). Results suggest that bark and leaf size is relatively unimportant compared with other elements. Likewise, texture of the leaves had a minimally positive mean of 4.11 and a neutral median of 4, but a mode of 5.

By far, the most desirable characteristic in the view of respondents in this neighborhood is strong branches with a mean of 6 and median/modes of 7. Also, positive characteristics were (in descending order), the size of the trees as they mature, the way the trees stretch across the street, the color of the leaves in the fall, the various shades of green of different trees, and the dense foliage. Here we see a preference for large trees as was noted by Schroeder and Ruffolo (1996) in the Midwest. It seems reasonable to accept the conclusion of Schroeder et al. (2006) that higher latitudes, cooler summer temperatures, and lower sun angles are involved.

In correlational analysis, color of leaves in the fall relates at a statistically significant level (P < 0.001) to all other aesthetic individual characteristics. Fall color also correlates to all items on the “trees on my street” scale at moderately weak to strong levels. One correlation was expected (e.g., large to small fruit r = 0.736, P = 0.000). Aesthetic elements of shades of green, showy bark, dense foliage, and texture of the leaves all had moderate to moderately strong statistically significant correlations. There seems less concern for specific aesthetic characteristics such as foliage color, texture, showy bark, and foliage density despite the fact that trees are often marketed for such characteristics. Thus, it would appear that residents would not be concerned about a mix of tree species with varying aesthetic characteristics on their street.

Negative Individual Tree Characteristics

There are some maintenance concerns about trees along the street and to get at this, four very common criticisms were presented and respondents were asked the degree to which each of these is a serious concern (Table 4). Responses ranged from 1 = “not at all” to 7 = “serious concern.” The scale had a reliability of 0.89.

In general, there were limited concerns about raking (3.32 with a mode of 1). Maintenance of the trees, as well as seeds and seedlings, were close to neutral at 3.94 but again with a mode of 1. Clearly, the largest concern was the damage to sidewalks from tree roots, which had a mode of 7 and a mean of 5.11. Overall, negative characteristics were viewed as neutral with a summated mean of 4.01.

All items regarding negative characteristics of trees are strongly and significantly correlated at the P < 0.001 level. Maintenance concern correlations with desirable characteristics are more revealing. Maintenance concerns correlate statistically with cleanliness of the street and flowers or blooms, especially in terms of seeds and seedlings, maintenance of the tree, and damage to sidewalks. Clearly, residents see a potential downside to some aesthetic benefits.

CONCLUSIONS

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Selecting large replacement trees that are attractive and provide an array of summer and fall colors, textures, and densities will ultimately be the characteristics that satisfy most respondents. Residents liked the large trees that make the neighborhood seem more mature. Such trees need to be trees that will grow to a size sufficient to arch across the street and provide the shade valued by residents. This is consistent with Schroeder’s work comparing attitudes toward street trees in the United States and the United Kingdom where U.S. residents preferred larger trees (Schroeder et al. 2006).

There might be consideration given to a mix of faster-growing trees and larger, long-lived trees that may be slower to mature, because residents most value the shade provided by the trees and the various values related to the shade. Variations in foliage colors in both summer and fall were valued. Downtown Chicago has an interesting practice of planting no more than three trees of the same species in a row. Chicago’s practice seems as if it would meet the resident’s desires as expressed in their responses. A mixture of species would also provide additional species diversity that might reduce the impact of another exotic pest that might again kill large numbers of trees in this neighborhood in the future.

Replacements might precede cutting of old trees to satisfy the need for trees adding to the quality of the street. In a situation such as EAB in which the pest might not be identified until the pest is established, the community may not have time to respond. Furthermore, many community budgets are stretched thin and the community might tend to delay action until the impact is apparent, which is now known to be 4 years or more after a tree is first attacked by EAB. Some aggressive and forward-looking Ohio communities have adopted an ash replacement program before the pest is identified in their community and are removing some ash each year.

Safety is an interesting issue in urban forestry. This was one of the concepts most strongly associated with positive feelings toward their street and neighborhood. Despite prior research showing trees assist in improving safety and the perception of safety, trees were neutrally associated with safety in this particular study. Perhaps urban foresters might try to reinforce these concepts as they begin to try to develop support for their programs. It would appear that this benefit is not well-known but might assist urban foresters as they compete with other agencies. Another issue might be the degree to which safety is embedded among other issues like in this study or viewed as a separate topic, which could alter the findings. Additional research is needed in this arena.

There are consistent concerns about cleanliness of the street related to trees. Damage to sidewalks and subsequent maintenance are concerns in Toledo, like in many communities. Interestingly, leaves do not appear to be an issue; perhaps Toledo’s pickup program or resident’s simple acceptance of fall leaf drop accounts for this. However, fruits, seedlings, twigs, branches, and trees that do not have strong branch attachments do appear to be considered problematic.

APPENDIX 1 SURVEY INSTRUMENT AS DISTRIBUTED

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My Street

There are many things that lead one to “like” their neighborhood and specifically their street. Below are a wide variety of reasons. For each, how important is this to you in terms of the street you live on? If it is not at all important or not applicable, you would circle a 1. If it is a very important reason, you would circle 7. If it is moderately important, you would circle a 4, 5, or 6.

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Think about the trees lining your street. There are various reasons people like having trees on a street, and some of them are listed below. How strongly do you feel each reason relates to how the trees on your street appeal to you; this time, the scale ranges from 1 being does not relate to me to 7 being a major reason you like the trees on your street.

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This series of items relates to the things you value about trees on your street. For each characteristic, how strongly do you value that particular element? 1 would be not at all and 7 would be you completely value it.

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There are some maintenance concerns about trees along the street. To what degree are each of these of concern to you, from not at all (1) to a serious concern (7)?

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  • © 2008, International Society of Arboriculture. All rights reserved.

LITERATURE CITED

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Arboriculture & Urban Forestry (AUF): 34 (1)
Arboriculture & Urban Forestry (AUF)
Vol. 34, Issue 1
January 2008
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Attitudes of Residents Toward Street Trees on Four Streets in Toledo, Ohio, U.S. Before Removal of Ash Trees (Fraxinus spp.) from Emerald Ash Borer (Agrilus planipennis)
Joseph Heimlich, T. Davis Sydnor, Matthew Bumgardner, Patrick O’Brien
Arboriculture & Urban Forestry (AUF) Jan 2008, 34 (1) 47-53; DOI: 10.48044/jauf.2008.007

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Attitudes of Residents Toward Street Trees on Four Streets in Toledo, Ohio, U.S. Before Removal of Ash Trees (Fraxinus spp.) from Emerald Ash Borer (Agrilus planipennis)
Joseph Heimlich, T. Davis Sydnor, Matthew Bumgardner, Patrick O’Brien
Arboriculture & Urban Forestry (AUF) Jan 2008, 34 (1) 47-53; DOI: 10.48044/jauf.2008.007
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Keywords

  • Agrilus
  • ash replacements
  • community safety
  • emerald ash borer
  • Fraxinus spp
  • green ash
  • resident attitudes
  • street trees

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