# Monitoring adaptation and productivity of teak plantations in Guinean zone of Togo: A comparative study of historical and newly introduced provenances

Kossi Novinyo Segla, Kossi Adjonou, Pyoabalo Alaba, Gilles Chaix, Kouami Kokou

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Kossi Novinyo Segla, Kossi Adjonou, Pyoabalo Alaba, Gilles Chaix, Kouami Kokou. Monitoring adaptation and productivity of teak plantations in Guinean zone of Togo: A comparative study of historical and newly introduced provenances. World Teak Conference (WTC 2025), KSCSTE; KFRI; TEAKNET; ITTO; Ministry of Agriculture; Forestry and Fisheries of Japan, Sep 2025, Kochi, India. pp.11. hal-05403017

HAL Id: hal-05403017

https://hal.science/hal-05403017v1

Submitted on 8 Dec 2025

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5th WTC 2025 - ITTO-BMLEH Teak Session

Theme: "Improving High-value Teak Timber for Sustainable Supply Chains"

Draft Program Schedule

Wednesday,
17 Sept 2025
14.00-16:00

ITTO-BMLEH Teak Session

Moderators: Dr. Tetra Yanuariadi (Projects Manager) &
Ms. Paula Sarigumba (Communications and Outreach Officer),
International Tropical Timber Organization (ITTO), Japan

<table><thead><tr><td>Time</td><td>Topic</td><td>Speaker</td></tr></thead><tbody><tr><td>14.00-14.10</td><td>Opening Remarks &amp; Group photo</td><td>Ms. Sheam SATKURU, ITTO Executive Director</td></tr><tr><td>14.10-14.20</td><td>ITTO-BMLEH project achievement and way forwards</td><td>Prof. Yongyut Trisurat, Kasetsart University, Bangkok, Thailand</td></tr><tr><td>14.20-14.30</td><td>The Role of Smallholder Teak Plantations in Indonesia's Forestry Sector: Models for Sustainable Development</td><td>Prof. Anto RIMBAWANTO, National Research and Innovation Agency (BRIN), Indonesia</td></tr><tr><td>14.30-14.40</td><td>Teak plantation in Cambodia</td><td>Mr. Cheat Vichit, Department of Forest Plantation and Private Forest Development, Cambodia</td></tr><tr><td>14.40-14.50</td><td>Smallholder Teak Plantations: Bridging the Demand and Supply Gap in India</td><td>Dr. R. Yasodha, Institute of Forest Genetics and Tree Breeding (IFGTB), Coimbatore, India</td></tr><tr><td>14.50-15.00</td><td>Promoting high-value teak timber for sustainable supply chains in Vietnam</td><td>Dr. Dang Thinh Trieu, Vietnamese Academy of Forest Sciences, Vietnam</td></tr><tr><td>15.00-15.10</td><td>Teak Clonal Test Plan for Selecting Superior Mother Trees for Commercial Plantation in Thailand</td><td>Ms. Somporn Khumchompoo, Royal Forest Department, Thailand</td></tr><tr><td>15.10-15.20</td><td>Monitoring adaptation and productivity of teak plantations in Guinean Zone of Togo: A comparative study of historical and newly introduced provenances</td><td>Presented by Prof. Adzo Dzifa KOKUTSE, University of Lome, Togo</td></tr><tr><td>15.20-15.30</td><td>Precision Control and Management of Teak Borer (Xyleutes ceramica Walker) in Thailand</td><td>Assoc. Prof. Dr. Wattanachai Tasen, Kasetsart University, Bangkok, Thailand</td></tr><tr><td>15.30-15.40</td><td>Bridging the Financial Gap for Teak Smallholders: A Review of Financing Models in South Asia, Southeast Asia and West Africa.</td><td>Dr. Sven Gunter, Thünen Institute of Forestry, Germany</td></tr><tr><td>15.40-15.55</td><td>Questions &amp; Discussion</td><td>All speakers</td></tr><tr><td>15.55-16:00</td><td>Summary and closing</td><td>ITTO</td></tr></tbody></table>

Note: Time allocation for technical presentation is 10 min; Inaugural Session starts at 17:00 hrs. Welcome Reception at 19:00 hrs
List of delegates from the ITTO-BMLEH Teak Project to attend the 5th World Teak Congress

<table><thead><tr><th>Country</th><th>Name</th><th>Affiliation</th></tr></thead><tbody><tr><td>ITTO</td><td></td><td></td></tr><tr><td>1</td><td>Ms. Sheam SATKURU</td><td>Executive Director, ITTO, Japan</td></tr><tr><td>2</td><td>Dr. Tetra Yanuariadi</td><td>ITTO Projects Manager</td></tr><tr><td>3</td><td>Ms. Paula Sarigumba</td><td>ITTO Communications and Outreach Officer</td></tr><tr><td>Germany</td><td></td><td></td></tr><tr><td>1</td><td>Dr. Sven Günter</td><td>Head of Working Group Forestry Worldwide, Thünen Institute of Forestry, Germany</td></tr><tr><td>2</td><td>Mr. Themesgen Zana Jaffo</td><td>Research Scientist, Thünen Institute of Forestry, Germany</td></tr><tr><td>Thailand</td><td></td><td></td></tr><tr><td>1.</td><td>Prof. Dr. Yongyut Trisurat</td><td>Regional Project Manager, ITTO-BMLEH Teak Project, Faculty of Forestry, Kasetsart University, Bangkok</td></tr><tr><td>2.</td><td>Assoc. Prof. Dr. Wattanachai Tasen</td><td>Head of the Department of Forest Biology, Faculty of Forestry, Kasetsart University, Bangkok</td></tr><tr><td>3.</td><td>Ms. Somporn Khumchompoo</td><td>Scientist, Senior Professional Level, Silvicultural Research Division, Forest Research and Development Office, Royal Forest Department (RFD)</td></tr><tr><td>4.</td><td>Ms Sangrawee Sukeetham</td><td>Forestry Technical Officer, Practitioner Level Forest Utilization Research and Development Division, Forest Research and Development Office, RFD</td></tr><tr><td>5.</td><td>Mr. Naravich Changtor</td><td>Forestry Technical Officer, Practitioner Level Forest Utilization Research and Development Division, Forest Research and Development Office, RFD</td></tr><tr><td>6.</td><td>Ms. Saichon Mutarapat</td><td>Secretary, ITTO-BMLEH Project</td></tr><tr><td>7.</td><td>Mr. Surasak Choowong</td><td>Sri Trang Rubber Plantation C., Ltd.</td></tr><tr><td>Cambodia</td><td></td><td></td></tr><tr><td>1.</td><td>Mr. Cheat Vichit</td><td>Consultant, Department of Forest Plantation and Private Forest Development (previously Forest Administration), Cambodia</td></tr><tr><td>2.</td><td>Mr. Phoung Sophea</td><td>Scientist, Department of Forest Plantation and Private Forest Development (previously Forest Administration), Cambodia</td></tr><tr><td>Vietnam</td><td></td><td></td></tr><tr><td>1</td><td>Dr. Tran Lam Dong</td><td>Vice President, Vietnamese Academy of Forest Sciences (VAFS)</td></tr><tr><td>2</td><td>Dr. Dang Thinh Trieu</td><td>National Coordinator, Vietnamese Academy of Forest Sciences (VAFS)</td></tr><tr><td>3</td><td>Dr. Vu Dinh Huong</td><td>Consultant# 1, Vietnamese Academy of Forest</td></tr></tbody></table>
<table><tr><td></td><td></td><td>Sciences (VAFS)</td></tr><tr><td>4</td><td>Dr. Mai Thi Phuong Thuy</td><td>Head of the Department of Plant Cell Technology, Vietnamese Academy of Forest Sciences (VAFS)</td></tr><tr><td>India</td><td></td><td></td></tr><tr><td>1</td><td>Dr. R. Yasodha</td><td>National Coordinator, Scientist G, Division of Plant Biotechnology<br>ICFRE- Institute of Forest Genetics and Tree Breeding, ICFRE-IFGTB)</td></tr><tr><td>2</td><td>Dr. Rekha R. Warrier</td><td>Deputy National Coordinator, Scientist, ICFRE-Institute of Forest Genetics and Tree Breeding</td></tr><tr><td>3</td><td>Dr. C. Nalin Kumar,</td><td>ITTO Consultant</td></tr><tr><td>4</td><td>Dr. Mohammad Ghouse</td><td>ITTO Consultant</td></tr><tr><td>5</td><td>Dr. T. Vamadevan</td><td>Information Officer, EIACP</td></tr><tr><td>6</td><td>Ms. P. Maheswari</td><td>Senior Project Associate</td></tr><tr><td>India</td><td></td><td></td></tr><tr><td>1</td><td>Dr. S. Sandeep</td><td>TEAKNET Coordinator, TEAKNET, Kerala, India</td></tr><tr><td>2</td><td>Dr. P.K. Thulasidas</td><td>ITTO Consultant# 5- Information Management, TEAKNET, Kerala, India</td></tr><tr><td>Indonesia</td><td></td><td></td></tr><tr><td>1.</td><td>Prof. Dr. Anto RIMBAWANTO</td><td>ITTO Consultant – Teak and other valuable species strategy development, Research Centre for Applied Botany, National Research and Innovation Agency (BRIN), YOGYAKARTA</td></tr><tr><td>Togo</td><td></td><td></td></tr><tr><td>1</td><td>Prof. Adzo Dzifa KOKUTSE</td><td>National Coordinator, University of Lomé, Togo, West Africa</td></tr><tr><td>Korea</td><td></td><td></td></tr><tr><td>1</td><td>Dr. Hwan-ok MA</td><td>Consultant, ITTO-BMLEH Project Research Professor (Tropical Forest) OJEong Resilience Institute, Korea University</td></tr></table>

Notes: At least 29 delegates from the participating countries, TEAKNET, Thunen and ITTO confirmed to attend the side event.

ABSTRACTS

(as of 29 May 2025)
# Monitoring adaptation and productivity of teak plantations in Guinean Zone of Togo: A comparative study of historical and newly introduced provenances

Kossi Novinyo SEGLA, Kossi ADJONOU, Pyoabalo Alaba, Gilles Chaix, **Kouami KOKOU**
Laboratoire de Recherche Forestière, Faculté des Sciences, Université de Lomé, Togo
Email: mimidam@hotmail.com

## Abstract

This study evaluates the growth performance of seven teak provenances planted at the Zogbepim forest station in Togo's Guinean zone. The goal is to optimize silvicultural practices, particularly thinning, to enhance plantation productivity and support the local timber industry. The studied provenances include Tonou (local), Indian, Tanzanian, Ivorian, and three Malaysian (Luasong, Perlis, and Taliwas). Planted with a 3m x 3m spacing, they were monitored in 2022 before thinning and in 2024 after thinning. Dendrometric parameters such as total height (Hm), dominant height (Ho), diameter at breast height (Dm), basal area (G), and spacing factor (S%) were measured. Statistical analysis (ANOVA) compared growth performance, and diameter structures were modeled using the Weibull distribution. Productivity was assessed using a site Index (Ip) based on dominant height and stand age. Results show significant variability among teak provenances before thinning (2022) and after thinning (2024). The Indian provenance had the highest diameter growth (12.87 ± 3.85 cm in 2022 and 17.91 ± 2.51 cm in 2024), while Luasong had the tallest trees (16.85 ± 2.88 m) and the highest basal area (18.94 ± 0.13 m²/ha) in 2024. The Tanzanian provenance also adapted well, with an average height of 15.70 ± 2.28 m and a basal area of 22.27 ± 0.14 m²/ha. Although Tonou showed slower height growth, it maintained a large diameter (17.22 ± 2.92 cm in 2024). The Ivorian, Perlis, and Taliwas provenances exhibited moderate growth. Thinning played a key role in reducing competition and improving growth, particularly for the Tanzanian and Luasong provenances. This study highlights the importance of selecting the right provenances and applying appropriate silvicultural practices to maximize teak plantation productivity in Togo. Further research is needed to explore wood quality and the influence of site conditions on growth.

**Keywords:** Teak provenances, silvicultural practices, thinning effects, growth performance, plantation productivity, Togo.