Ryan W. Klein

Ryan W. Klein
University of Florida | UF · Department of Environmental Horticulture

Doctor of Philosophy

About

21
Publications
10,633
Reads
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156
Citations
Citations since 2017
19 Research Items
155 Citations
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Introduction
Skills and Expertise

Publications

Publications (21)
Article
Full-text available
Urban trees are often more sun- and wind-exposed than their forest-grown counterparts. These environmental differences can impact how many species grow–impacting trunk taper, crown spread, branch architecture, and other aspects of tree form. Given these differences, windthrow models derived from traditional forest production data sources may not be...
Article
When professionals assess tree risk, they must consider the potential consequences associated with a branch or whole tree striking a person, vehicle, or structure. This process requires an assessor to determine the diameter and fall distance of a tree part and then gauge the likely damage to a target if failure occurred. The ability to accurately e...
Preprint
Full-text available
Urban trees are often more sun-and wind-exposed than their forest-grown counterparts. These environmental differences can impact how many species grow-impacting trunk taper, crown spread, branch architecture, and other aspects of tree form. Given these differences, wind-throw models derived from traditional forest production data sources may not be...
Article
Drenching and injection are two pesticide application methods that are particularly effective in controlling some of the most troublesome insect pests of ornamental landscape trees. This 4-page document describes the equipment and procedures you will need to carry out either of these methods. Written by Frederick M. Fishel and published by the UF/I...
Article
Most tree risk assessment methods task the assessor with the evaluation of a tree’s likelihood of impact (i.e. likelihood a target is present during failure) when determining the probability that an adverse event will occur. While this is generally accomplished qualitatively based on visual cues; during the 15 to 20 minutes an assessor is at a loca...
Article
Arborists, urban foresters, and other tree care professionals commonly use visual risk assessment methods to evaluate tree safety. Most methods used by professionals have three main inputs: likelihood of impact, likelihood of failure, and consequences of failure. In assessing the latter, the size of the tree part expected to fail and its fall dista...
Article
Professional judgment is derived from a person’s intuition, training, and level of expertise. When exploring the influence that expertise has on the process of tree risk assessment, it is helpful to approach the topic in relation to its impact across various related fields and disciplines. This paper reviews the effects of arboricultural and tree r...
Article
Visual risk assessment remains the primary means of gauging urban tree safety and is a key facet of storm preparation and response. While past research has investigated the reproducibility of risk assessment methodologies (i.e., precision), few, if any, studies truly address the accuracy of current inspection practices — especially with regard to t...
Article
Full-text available
Trees in residential landscapes provide many benefits, but can injure persons and damage property when they fail. In hurricane-prone regions like Florida, USA, the regular occurrence of hurricanes has provided an opportunity to assess factors that influence the likelihood of wind-induced tree failure and develop species failure profiles. We assesse...
Preprint
Full-text available
Trees in residential landscapes provide many benefits, but can injure persons and damage property when they fail. In hurricane-prone regions like Florida, USA, the regular occurrence of hurricanes has provided an opportunity to assess factors that influence the likelihood of wind-induced tree failure and develop species failure profiles. We assesse...
Preprint
Full-text available
This is a study conducted on trees risk assessed prior to Hurricane Matthew (tropical storm strength by the time it hit our study trees). We had two main research goals: 1. Predict failure using the various tree inventory/risk assessment data collected, and 2. See if professional arborists could effectively predict tree failure before a storm.
Article
Full-text available
The topic of wire basket removal during planting remains an area of contention among nursery growers, landscapers, and arborists who work with balled-and-burlapped planting material. Those in favor of removal fear that the burlap and wire surrounding a tree's root ball will impede root regrowth and eventually lead to the girdling of any roots that...
Article
Full-text available
In the presence of a target, tree failures have the potential to damage property, disrupt services, or threaten public safety. Worldwide, several qualitative methods have been developed to provide a systematic approach for tree risk assessment and management. The consistency and accuracy of these methods, the values placed on the tree in question a...
Preprint
Full-text available
A study looking at the impacts of wire basket retention/removal on the growth and survival of ash 9 years after planting. Study was conducted in Nebraska. It is slated for publication in Arboriculture & Urban Forestry. Posted with consent from AUF EIC and Managing Editor.
Preprint
Full-text available
A literature review on Risk Assessment and Risk Perception. Submitted and accepted to Arboriculture & Urban Forestry. Posted with permission from the EIC and managing editor.
Article
Butterfly weed is a member of the milkweed family and by some reports, the only Asclepias that does consistently well in south Florida. Original publication date October, 1999. This revision by Ryan W. Klein and Gail Hansen, August 2018.
Article
Shrub Fact Sheet on Abelia grandiflora, updated November 2017 by Ryan W. Klein and Gail Hansen.
Article
Tree risk assessments can be categorized by their time, training, and equipment requirements. In arboriculture and urban forestry, practitioners must select a risk assessment method that is appropriate for the tree or trees to be assessed, available resources, and management objectives. While more detailed advanced risk assessment levels are believ...
Article
Arborists and tree care professionals assess tree risk by considering likelihood of impacting a target, likelihood of failure, and consequence of failure (should a target be impacted). For basic risk assessments, these three factors are typically assessed qualitatively using visual cues, though it is possible to quantify target occupancy (as it rel...

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