Episodes

  • EAC's First ETW certification in Hong Kong
    Jan 10 2025

    In this episode of Talking Trees, we discuss the first European Tree Worker (ETW) exam held in Hong Kong, which highlighted significant gaps in local training and skills. The exam, covering both practical and theoretical modules such as tree identification, pruning, and Visual Tree Assessment (VTA), revealed that Hong Kong arborists fall short of international standards. Sammy Au, the author of the report, emphasizes the need for improved education and preparation to help local arborists compete globally and enhance the quality of tree care. The episode concludes with an announcement of upcoming exams and a call for arborists to participate and raise their professional level.

    Background information:

    • https://www.eac-arboriculture.com


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    • https://arboristickaakademie.cz


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    11 mins
  • 🔒 Vitality Assessment in Detail
    Jan 9 2025

    Subscriber-only episode

    In this episode of Talking Trees, we focus on assessing tree vitality, exploring various methods and approaches used for evaluation. The discussion includes a detailed analysis of visual indicators such as foliage, branch structure, and the presence of epicormic shoots. We introduce the ARCHI method, which classifies the physiological condition of trees based on their architectural types, as well as other techniques like SSM, highlighting their advantages and limitations. The episode concludes with an overview of factors affecting vitality, including shading and pest infestations.

    Background information:

    • European Tree Planting Standard
      • https://www.europeanarboriculturalstandards.eu
    • Czech Tree Planting Standard


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    14 mins
  • 🔒 Tree Planting - Quality of Planting Stock
    Jan 8 2025

    Subscriber-only episode

    In this episode of Talking Trees, we explore the quality requirements for trees intended for planting. We detail different types of trees—bare-rooted, balled, and container-grown—and their specific standards regarding root systems, trunks, and crowns. The episode discusses technical norms, quality assessment criteria, defect tolerance, and inspection procedures. Emphasis is placed on the importance of selecting trees adapted to site conditions, with recommendations to choose smaller trees for easier adaptation and reduced maintenance needs. The discussion is supported by tables of ball dimensions and weights relative to tree size and illustrative visuals.

    Background information:

    • Technická norma: Pro okrasné dřeviny platí ČSN 46 4902-1 – Výpěstky okrasných dřevin – všeobecná ustanovení a ukazatele jakosti
    • Technická norma: Kvalitativní ukazatele lesnických sazenic upravuje ČSN 48 2115 – Sadební materiál lesních dřevin z roku 1998 a její změna Z 1 z roku 2002
    • Technická norma: Výroba výpěstků ovocných dřevin je usměrňována prováděcí vyhláškou č. 129/2012 Sb.23. k zákonu o oběhu osiva a sadby
    • European Tree Planting Standard
      • https://www.europeanarboriculturalstandards.eu


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    25 mins
  • 🔒 Tree Ascent
    Jan 7 2025

    Subscriber-only episode

    In this episode of Talking Trees, we delve into tree climbing techniques with a focus on selecting and installing anchor points in the tree canopy. We explore various ascent methods, including Moving Rope Technique (MRT) and Stationary Rope Technique (SRT), highlighting safety aspects and emergency evacuation procedures. Detailed guidance is provided on rope installation, anchoring methods, and the use of specialized equipment. Emphasis is placed on the safe application of all techniques, risk minimization, and the invasive nature of spurs, along with instructions for their use.

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    21 mins
  • 🔒 Meristems
    Jan 6 2025

    Subscriber-only episode

    In this episode of Talking Trees, we dive into the fascinating world of plant meristems—tissues composed of undifferentiated cells capable of division that form the foundation of plant growth. We discuss the various types of meristems, including apical, lateral, and intercalary, their roles in primary and secondary growth, and the molecular mechanisms regulating their activity. The episode also covers the influence of phytohormones and genes on meristem function, as well as the role of meristems in cloning and vegetative propagation of plants.

    Background information:

    • Wikipedia


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    14 mins
  • RECAP - CW 01/2025
    Jan 5 2025

    Welcome to the Sunday recap episode of Talking Trees, where we summarize the key insights from this week’s episodes. Let’s review what we covered from Monday to Saturday:

    Monday 30 - Mycorrhiza and Root Symbiosis
    We delved into the fascinating world of mycorrhiza, the symbiotic relationship between fungi and plants. We explored different types of associations, such as ectomycorrhiza and arbuscular mycorrhiza, their role in nutrient cycling, and their impact on ecosystems. We also touched on the mechanisms behind this symbiosis, its evolutionary history, and its importance for plant growth and health.

    Tuesday 31 - Accessing Trees
    Tuesday’s episode focused on safe tree access techniques for arborists. We discussed methods for setting up ropes using throwlines, hooks, and climbing systems. Safety guidelines for working with ladders and telescopic poles were emphasized, along with the importance of following proper techniques and safety protocols for working at height.

    Wednesday 32 - Dutch Elm Disease
    We examined Dutch elm disease, a devastating fungal disease spread by bark beetles. The episode highlighted its impact in northwest Russia, its effects on the photosynthetic properties of susceptible and resistant elm species, and the volatile compounds involved. We also provided an overview of the disease’s history, its spread, and strategies to combat it, including the development of resistant elm hybrids.

    Thursday 33 - Defects, Features, Symptoms, and Microhabitats
    On Thursday, we discussed tree defects and symptoms, distinguishing between physiological signs (symptoms) and structural issues (defects). We also explored tree microhabitats, which support biodiversity on aging trees, and reviewed common tree defects like included bark, dead branches, cracks, and cavities. Their implications for tree stability and risk management were also explained.

    Friday 34 - Fistulina Hepatica
    Friday’s episode spotlighted Fistulina hepatica, also known as the beefsteak fungus. We explored its unique appearance, ecological functions, and its role in brown rot decay. The episode also covered its positive contributions to ecosystems, culinary uses, and health benefits, highlighting this fungus as more of a friend than a foe.

    Saturday 35 - European Arboricultural Standard Conference - Prague 2025
    We concluded the week by discussing the 2025 European Arboricultural Standard Conference in Prague. We introduced Professor Francesco Ferrini, a leading expert in urban arboriculture, and his research on trees’ adaptation to urban environments and air pollution mitigation. The conference’s focus on tree evaluation standards, tree value calculation, and tree protection during construction was also covered.

    Join us in this recap episode to revisit these engaging topics and insights from the week on Talking Trees!


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    19 mins
  • European Arboricultural Standard Conference - Prague - 2025
    Jan 4 2025

    In this episode of Talking Trees, we highlight the work of Professor Francesco Ferrini, a leading expert in urban arboriculture whose research focuses on the impact of trees on air pollution and their adaptation to urban environments. We also discuss the European Arboriculture Conference held in Prague on February 13–14, 2025, which covered various aspects of tree care, including tree assessment, protection, and economic value. Professor Ferrini was one of the keynote speakers at the event, sharing his valuable insights with attendees.

    Background information:

    • https://www.europeanarboriculturalstandards.eu


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    16 mins
  • 🔒 Fistulina hepatica
    Jan 3 2025

    Subscriber-only episode

    In this episode of Talking Trees, we explore the oak-loving fungus Fistulina hepatica, its occurrence on oaks and other trees, and its role in wood decay through brown rot. We discuss how it affects the mechanical properties of wood and its various uses. The episode highlights the fungus’s morphological traits, including its rare anamorphic stage (Confistulina hepatica), spore dispersal, and ecological significance in forest ecosystems. Additionally, we touch on its culinary applications and potential health benefits.

    Background information:

    • Humphries. 2017. Confistulina_ a rare and little-known state of Fistulina hepatica.pdf
    • Marčiulynas et Menkis. 2023. The Release and Spread of Basidiospores of Red-Listed Wood-Decay Fungus Fistulina hepatica in Oak Stands.pdf
    • Schwarze et al. 2000. Dual modes of degradation by Fistulina hepatica in xylem cell walls of Quercus robur.pdf
    • podcast Arboristika aktuálně, #041 - Pstřeň dubový

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    10 mins