You get what you pay for in a consulting arborist
I take education and knowledge seriously. Here are classes I have attended just over the past 3 years. 245 hours toward 60 needed for recertification.
Knowledge and education costs in time and dollars. That is why I charge for my expertise. That "free" estimate isn't really free.
CEU Report
ISA Continuing Education Unit (CEU) Report
- For:Ronald E. Rothhaas
- Customer Service ID:162163
- CertificationID:OH-5177B
Ronald E. Rothhaas
Arbor Doctor LLC
PO Box 11094
Cincinnati OH 45211
UNITED STATES
Board Certified Master Arborist
| 4/24/2025 | IN-25-038 | Prescription Pruning | 2.00 | 1.00 | 12.00 |
| 3/13/2025 | OH-25-089 | The S-List - The Most Sustainable Plants for Urban Landscapes | 0.75 | 0.00 | 0.00 |
| 3/11/2025 | OH-25-023 | Herbicides - Think before you commit | 1.00 | 0.00 | 0.00 |
| 2/6/2025 | OH-25-028 | Horticulture Myths, Lies, and B.S. | 1.00 | 0.00 | 0.00 |
| 2/6/2025 | OH-25-032 | ODA Regulatory Update | 0.00 | 1.00 | 0.00 |
| 2/6/2025 | OH-25-034 | UK plant Disease Diagnostic Lab Update | 0.00 | 0.00 | 1.00 |
| 2/6/2025 | OH-25-035 | Industrial Vegetation Management | 0.00 | 1.00 | 0.00 |
| 2/6/2025 | OH-25-038 | Healthy Soil Healthy Food Webs | 1.00 | 0.00 | 0.00 |
| 2/6/2025 | OH-25-040 | A Green Tapestry: Weaving Nature into Urban Infrastructure | 0.00 | 1.00 | 0.00 |
| 12/17/2024 | PP-25-051 | Biochar for Tree Growth and Water Quality: Exploring potential in urban and disturbed soils | 0.00 | 1.00 | 0.00 |
| 12/7/2024 | AS-24-025 | Soil Oxygen: The Real Limiting Factor for Urban Trees and Q&A with Gordon Mann | 1.00 | 0.00 | 0.00 |
| 12/7/2024 | AS-24-026 | Case Capsule: Soil Depth Analysis Project / Conserving the Nunnally Oak/ The Novela of the Nebulous Nursery | 0.50 | 0.50 | 0.00 |
| 12/7/2024 | AS-24-027 | Properly Photographing Trees and Q&A with Rick Burress | 0.00 | 0.00 | 1.00 |
| 12/7/2024 | AS-24-028 | What Do Attorneys Need/Want from an Expert and Q&A with Keith Turner & Jacqueline Bouché | 0.00 | 1.00 | 0.00 |
| 12/7/2024 | AS-24-029 | Post-Conference Optional Activity: Photography Field Workshop | 0.00 | 0.00 | 3.00 |
| 12/7/2024 | AS-24-030 | Post-Conference Workshop: Tree Biology & Wound Responses | 0.00 | 3.00 | 0.00 |
| 12/6/2024 | AS-24-019 | Branding Your Consulting Practice and Q&A with Susan Iris | 0.00 | 1.00 | 0.00 |
| 12/6/2024 | AS-24-020 | Tree-ring Diaries: What Does Wood Tell Us? and Q&A with Kiyomi Morino | 1.25 | 0.00 | 0.00 |
| 12/6/2024 | AS-24-021 | Case Capsule: At First You Don't Succeed Sue/ Not So Basic, Basic Tree Survey/ Eucalyptus Trees on Marine Avenue in Newport Beach | 0.00 | 0.50 | 0.50 |
| 12/6/2024 | AS-24-022 | The Appraiser is in Charge of the Appraisal; Not the Guide and Q&A with Lew Bloch | 0.00 | 1.00 | 0.00 |
| 12/6/2024 | AS-24-023 | Developing a Team Approach to a Complex Assignment with Q&A with Doug Malawsky & Tom Pope | 0.00 | 1.00 | 0.00 |
| 12/6/2024 | AS-24-024 | Roadside Tree Protection: The history of avenues and their future under the European vision of forgiving roads - Vision Zero and Q&A with Katharina Dujesiefken | 0.00 | 0.00 | 1.00 |
| 12/5/2024 | AS-24-015 | Trees: A Lifespan Approach - Inspired by Ancient Trees and Q&A with Neville Fay | 1.25 | 0.00 | 0.00 |
| 12/5/2024 | AS-24-016 | The CODIT Principle and Consequences for Tree Care and Q&A with Dirk Dujesiefken | 0.00 | 0.00 | 1.50 |
| 12/5/2024 | AS-24-017 | Operating an Arboriculture Consulting Business and Q&A with Jim Ingram | 0.00 | 1.50 | 0.00 |
| 12/5/2024 | AS-24-018 | Enhancing Urban Tree Survival through Nature-Based Solutions and Soil Remediation and Q&A with Glynn Percival | 0.00 | 0.50 | 1.00 |
| 12/5/2024 | AS-24-043 | Round Table Discussions | 0.00 | 1.00 | 0.00 |
| 12/4/2024 | AS-24-013 | Pre-Conference Optional Activity: University of Arizona Laboratory of Tree-Ring Research | 4.00 | 0.00 | 0.00 |
| 12/4/2024 | AS-24-014 | Pre-Conference Workshop: Conservation Arboriculture | 0.00 | 4.00 | 0.00 |
| 11/16/2024 | OH-24-218 | Native Plant Symposium | 3.50 | 0.00 | 0.00 |
| 11/7/2024 | KY-24-066 | Tough Trees for Urban Landscapes | 0.00 | 0.00 | 1.50 |
| 10/24/2024 | OH-24-213 | Pruning Workshop | 0.00 | 0.00 | 3.00 |
| 10/18/2024 | OH-24-209 | Prescription Pruning Workshop | 3.25 | 0.00 | 3.00 |
| 10/17/2024 | OH-24-208 | Prescription Pruning Workshop | 3.25 | 0.00 | 3.00 |
| 9/9/2024 | OH-24-173 | OGIA’s Diagnostic Walkabout - Boone Co Arboretum (Boone, KY) | 1.50 | 0.00 | 1.50 |
| 8/29/2024 | OH-24-184 | Cincinnati Plant Trials Day 2024 | 5.00 | 0.00 | 0.00 |
| 8/12/2024 | CF-24-060 | ISA Mainstage General Session and Awards of Distinction | 0.00 | 2.00 | 0.00 |
| 8/12/2024 | CF-24-061 | ISA Mainstage: Closing Session | 0.00 | 2.00 | 0.00 |
| 8/12/2024 | CF-24-001 | Welcome/ISA at 100 Back and Forward | 0.00 | 2.00 | 0.00 |
| 8/12/2024 | CF-24-003 | Concurrent Keynote Session 3 Mike Raupp & Francesco Ferrini | 1.00 | 0.00 | 0.00 |
| 8/12/2024 | CF-24-004 | Taking the 'Defect' out of Tree Risk Assessment | 0.00 | 0.75 | 0.00 |
| 8/12/2024 | CF-24-009 | Leaves of Legacy: Historical Trees Shaping Our Future | 0.00 | 0.75 | 0.00 |
| 8/12/2024 | CF-24-013 | Tips and Tricks for Writing Effective Arborist Reports | 0.00 | 0.75 | 0.00 |
| 8/12/2024 | CF-24-017 | AREA Student Sessions | 0.25 | 0.50 | 0.25 |
| 8/12/2024 | CF-24-027 | Long-term Effects of Urban Soil Rehabilitation on Tree Growth | 0.75 | 0.00 | 0.00 |
| 8/12/2024 | CF-24-034 | Climate Action Programs: Biodiversity Gains—Think Big Picture | 0.00 | 1.00 | 0.00 |
| 8/12/2024 | CF-24-044 | 100 Years of United States Forest Service Research and Development, Past and Future | 0.00 | 1.00 | 0.00 |
| 8/12/2024 | CF-24-049 | Reduce the Crown, Retain the Tree—International Perspectives | 0.00 | 0.00 | 0.75 |
| 8/12/2024 | CF-24-053 | Industry Conversation - 100 Years Of History | 0.00 | 0.75 | 0.00 |
| 8/11/2024 | CF-24-057 | Morphophysiology, tree assessment and tree management I Pre-Conference Workshop | 2.00 | 6.00 | 0.00 |
| 8/10/2024 | CF-24-056 | Tree Biomechanics Workshop I Pre-Conference Workshop | 4.00 | 0.00 | 4.00 |
| 8/5/2024 | OH-24-172 | OGIA’s Diagnostic Walkabout - Cincinnati Zoo & Botanical Gardens (Cincinnati, OH) | 1.50 | 0.00 | 1.50 |
| 7/9/2024 | AS-24-010 | Tree and Plant Appraisal Qualification Day 1 (Dates May Vary) | 0.00 | 7.75 | 0.00 |
| 7/8/2024 | OH-24-171 | OGIA’s Diagnostic Walkabout - Smale Park (Cincinnati, OH) | 1.50 | 0.00 | 1.50 |
| 6/3/2024 | OH-24-170 | OGIA’s Diagnostic Walkabout - Mt. Airy Arboretum (Cincinnati) | 1.50 | 0.00 | 1.50 |
| 5/6/2024 | OH-24-159 | Ohio Green Industry Walkabout | 0.00 | 0.00 | 3.00 |
| 3/14/2024 | OH-24-111 | Sustainable Urban Landscapes Symposium | 3.00 | 1.00 | 2.50 |
| 3/7/2024 | KY-24-034 | Upcoming Insect Issues: Spotted Lanternfly, Box Tree Moth, etc. | 1.00 | 0.00 | 0.00 |
| 3/7/2024 | KY-24-035 | Fungal Decay in Trees | 1.25 | 0.00 | 0.00 |
| 3/7/2024 | KY-24-036 | Bat Habitat Management | 0.00 | 0.50 | 0.00 |
| 3/7/2024 | KY-24-037 | Chainsaw Safety | 0.00 | 0.00 | 1.00 |
| 3/7/2024 | KY-24-045 | Tree Talk and Walk Discussion | 1.00 | 0.00 | 0.00 |
| 2/23/2024 | KY-24-006 | Insect Pests of Trees in the Urban Landscape: Diagnosis and Treatment of Insect Pests in Trees | 1.00 | 0.00 | 0.00 |
| 2/23/2024 | KY-24-007 | Spotted Lanternfly | 1.00 | 0.00 | 0.00 |
| 2/23/2024 | KY-24-009 | Soils | 1.00 | 0.00 | 0.00 |
| 2/23/2024 | KY-24-010 | Invasion of the Insects | 1.00 | 0.00 | 0.00 |
| 2/23/2024 | KY-24-011 | Survey Results of Root Rots in Landscape and Nursery Plants | 0.00 | 1.00 | 0.00 |
| 2/22/2024 | KY-24-001 | Trees On Wires/Trees Under Tensionj | 0.00 | 0.00 | 1.00 |
| 2/22/2024 | KY-24-002 | Tree Disease Update - Common and Emerging Diseases in Kentucky's Urban Forests | 1.00 | 0.00 | 0.00 |
| 2/22/2024 | KY-24-003 | Therapeutic Forest and Nature Immersion: Enriching and Supporting Health and Well-being of People and Forests | 0.00 | 0.00 | 1.00 |
| 2/22/2024 | KY-24-004 | Safety Difficulty | 0.00 | 0.00 | 1.00 |
| 2/22/2024 | KY-24-005 | Honeybees: How they choose what trees to live on and how to work or remove a hive in a tree | 0.00 | 0.00 | 1.00 |
| 2/8/2024 | OH-23-340 | Influence of Soil Amendments | 1.00 | 0.00 | 0.00 |
| 2/8/2024 | OH-23-345 | Ticks in Ohio | 1.00 | 0.00 | 0.00 |
| 2/8/2024 | OH-23-346 | Tree Amigos: Trees, Pests, Pathogens, Problems, and Perspectives | 1.00 | 0.00 | 1.00 |
| 2/7/2024 | OH-23-323 | Weird Things Bugs Do | 1.50 | 0.00 | 0.00 |
| 2/7/2024 | OH-23-331 | Phenology for Insect Predictions | 1.00 | 0.00 | 0.00 |
| 2/7/2024 | OH-23-332 | Increasing Climate Resiliency in Your Community with Adaptable Trees and Green Infrastructure | 0.00 | 1.00 | 0.00 |
| 2/7/2024 | OH-23-333 | Planning for Ohio’s Tree Canopy with Assessments | 0.00 | 1.00 | 0.00 |
| 2/7/2024 | OH-23-334 | Challenges Above and Below Ground in the Urban Landscape | 0.00 | 0.00 | 1.00 |
| 2/6/2024 | OH-23-315 | Climate Change, What to Plant | 1.00 | 0.00 | 0.00 |
| 2/6/2024 | OH-23-317 | Studies Evaluating the Role of Endophytes in Tree Disease Resilience | 1.00 | 0.00 | 0.00 |
| 2/6/2024 | OH-23-318 | Box Tree Moth, Spotted Lanternfly, and the invasive insects of Ohio | 2.00 | 0.00 | 0.00 |
| 2/1/2024 | OH-24-061 | Keynote: Climate Action in the Green Industry | 0.00 | 1.00 | 0.00 |
| 2/1/2024 | OH-24-071 | Examining the benefits and challenges of landscape diversification | 0.00 | 0.00 | 1.00 |
| 1/24/2024 | KY-24-014 | Tree Decay Process: The Science of Fungal Cankers and Wood Rot | 7.00 | 0.00 | 0.00 |
| 1/23/2024 | IN-24-005 | The Urban Green Infrastructure Resilience Cohort | 0.00 | 1.00 | 0.00 |
| 1/23/2024 | IN-24-055 | Tree Decay Workshop | 3.00 | 0.00 | 1.00 |
| 12/1/2023 | OH-23-376 | Taking Root Professionals Seminar | 1.00 | 3.00 | 1.75 |
| 11/30/2023 | KY-23-086 | State of the Trees | 2.00 | 0.00 | 0.00 |
| 11/30/2023 | MW-23-263 | Chainsaw Safety and Tree Felling | 0.00 | 0.00 | 6.00 |
| 11/15/2023 | MW-23-255 | Landscape & Turf Disease Update for 2023 | 0.00 | 0.00 | 1.00 |
| 11/15/2023 | MW-23-257 | Environmental Stressors and the Plants That Survive Them | 0.00 | 0.00 | 1.00 |
| 11/7/2023 | OH-23-270 | Bridging Gaps in Communication Styles | 0.00 | 1.00 | 0.00 |
| 11/7/2023 | OH-23-274 | Ohio Department of Agriculture Update | 0.00 | 1.00 | 0.00 |
| 11/7/2023 | OH-23-278 | National Standards And Sustainability - Without The Former, We Won’t Get The Latter | 0.00 | 1.00 | 0.00 |
| 11/7/2023 | OH-23-281 | Diagnosing and Managing Tree Decline | 0.00 | 0.00 | 1.00 |
| 11/7/2023 | OH-23-284 | The Nuts & Bolts of Pruning: Theory, Tools, Technique, & Timing | 0.00 | 0.00 | 1.00 |
| 11/7/2023 | OH-23-287 | Navigating Peoplescapes | 0.00 | 1.00 | 0.00 |
| 11/6/2023 | OH-23-249 | Managing Through Change | 0.00 | 1.00 | 0.00 |
| 11/6/2023 | OH-23-255 | Building Successful Field Leadership | 0.00 | 1.00 | 0.00 |
| 11/6/2023 | OH-23-257 | Key Aspects of A Better Business | 0.00 | 1.00 | 0.00 |
| 11/6/2023 | OH-23-258 | Student Perspectives on Internships & Employment | 0.00 | 1.00 | 0.00 |
| 11/6/2023 | OH-23-263 | Native Alternatives to Popular Landscaping Plants | 1.00 | 0.00 | 0.00 |
| 11/6/2023 | OH-23-267 | Trees - What You Don’t Know Can Kill Them | 1.00 | 0.00 | 0.00 |
| 10/17/2023 | MW-23-258 | Air Spade Demo Workshop | 3.00 | 0.00 | 0.00 |
| 10/12/2023 | PP-23-3439 | Growth, Physiology, and Early Root Development in Seedlings Treated with Biostimulants | 0.00 | 0.50 | 0.00 |
| 10/12/2023 | PP-23-3447 | Out of Sight, Top of Mind | 0.50 | 0.00 | 0.00 |
| 10/12/2023 | PP-23-3449 | Paclobutrazol Decreases Root System Growth in Small Containerized Trees | 0.50 | 0.00 | 0.00 |
| 10/12/2023 | PP-23-3453 | The Association of Phytophthora Root Rot with Rapid Oak Decline | 0.50 | 0.00 | 0.00 |
| 10/12/2023 | PP-23-3456 | Root Collar Burial: Is It Always Bad? | 0.50 | 0.00 | 0.00 |
| 10/12/2023 | PP-23-3457 | Fabric Grow Bags for Improved Root Development | 0.50 | 0.00 | 0.00 |
| 10/12/2023 | PP-23-3441 | Underground Battleground | 0.50 | 0.00 | 0.00 |
| 10/12/2023 | PP-23-3442 | Tree Water Use by Young Trees | 0.50 | 0.00 | 0.00 |
| 10/12/2023 | PP-23-3462 | Selecting Root Traits and Root Strategies | 0.50 | 0.00 | 0.00 |
| 10/12/2023 | PP-23-3466 | Trees First:The Public Spaces of the Forest-City | 0.50 | 0.00 | 0.00 |
| 10/12/2023 | PP-23-3467 | Production of High Quality, Fibrous Root Systems | 0.50 | 0.00 | 0.00 |
| 10/11/2023 | PP-23-3469 | Soil Oxygen: The Real Limiting Factor for Urban Trees | 0.50 | 0.00 | 0.00 |
| 10/11/2023 | PP-23-3464 | Biochar Effects on Roadside | 0.50 | 0.00 | 0.00 |
| 10/11/2023 | PP-23-3446 | Biochar and Urban Trees | 0.50 | 0.00 | 0.00 |
| 10/11/2023 | PP-23-3460 | Impact of Root Trenching on Tree Stability | 0.50 | 0.00 | 0.00 |
| 10/11/2023 | PP-23-3451 | Simultaneous Estimationg of Trunk and Root Plate Stiffness | 0.50 | 0.00 | 0.00 |
| 10/11/2023 | PP-23-3452 | Rooting Volumes for Tree Growth in Inner Cities | 0.75 | 0.00 | 0.00 |
| 10/11/2023 | PP-23-3440 | Are Pavements a Major Cause of Tree Decline? | 0.00 | 1.00 | 0.00 |
| 10/11/2023 | PP-23-3438 | Optimizing Tree Responses to Root Pruning In Mature Trees: An Introduction to Some New Rese | 0.00 | 0.50 | 0.00 |
| 10/10/2023 | PP-23-3470 | Assessing the Stability of Urban Trees | 2.00 | 0.00 | 1.00 |
| 9/30/2023 | MW-23-249 | Hazard Tree Removal | 0.00 | 0.00 | 1.00 |
| 9/11/2023 | OH-23-158 | Diagnostic Walkabout - Boone Co Arboretum | 1.50 | 0.00 | 1.50 |
| 8/7/2023 | OH-23-156 | Diagnostic Walkabout - Smale Riverfront Park | 1.50 | 0.00 | 1.50 |
| 7/27/2023 | OH-23-155 | Diagnostic Walkabout - Columbus Zoo & Aquarium | 1.00 | 0.00 | 1.00 |
| 7/10/2023 | OH-23-153 | Diagnostic Walkabout - Cincinnati Zoo & Botanical Garden | 1.50 | 0.00 | 1.50 |
| 6/8/2023 | AS-23-009 | Who Owns Boundary Trees | 0.00 | 1.00 | 0.00 |
| 6/5/2023 | OH-23-152 | Diagnostic Walkabout - Mt. Airy Arboretum & Forest | 1.50 | 0.00 | 1.50 |
| 5/8/2023 | OH-23-151 | Diagnostic Walkabout - Spring Grove Cemetery & Arboretum | 1.50 | 0.00 | 1.50 |
