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Accueil du site → Master → Pays Bas → 2002 → Control of invasive Chromoieana odorate L.R.M. King and H. Robinson : an evaluation of its efficacy in Futululu state forest, South Africa

International Institute for Geo-Information Science and Earth Observation (ITC) 2002

Control of invasive Chromoieana odorate L.R.M. King and H. Robinson : an evaluation of its efficacy in Futululu state forest, South Africa

Delfino Abeya, J.A

Titre : Control of invasive Chromoieana odorate L.R.M. King and H. Robinson : an evaluation of its efficacy in Futululu state forest, South Africa.

Auteur : Delfino Abeya, J.A

Etablissement de soutenance : University of Twente International Institute for Geo-Information Science and Earth Observation (ITC)

Grade : Master of Science in Geo-Information Science and Earth Observation 2002

Résumé
Chromoleana odorata is one of the worse environmental weeds threatening both the natural and man- aged ecosystems. Introduced in 1940s in South Africa, this species has naturalized and invaded most of the tropical and Sub-tropical regions of the country. In the Province of KwaZulu and in particular the Greater St. Lucia, threatens biodiversity, eco-tourism, forestry, watershed management and sus- tainable farm management. Control programme has been initiated to reduce the impact of this species. However, little has been known about the efficacy of the control strategy being used. The aim of this study was to assess and evaluate the efficacy of the control strategy. It was also in- tended to determine and analyze the factors affecting the control efficacy. To achieve the objectives of this study, a combination of field observations related to the cover of C. odorata and the related bio- physical data and secondary data on the control of C. odorata were used. The results showed that the current control strategy has significantly reduced the cover of C. odorata. Considering factors such as number of treatment and time lapse, the result indicated that C. odorata cover increases with both number of treatments and time lapse since last treatment. With the bio- physical factors, the result showed that the most important factors affect the efficacy of the control are tree cover, grass cover, number of invasive alien plant species and consistency of treatment. However, the combination of these factors can explain only about 45% of the variability in the cover of C. odo- rata within the management blocks. Therefore, based on the result, while number of treatments does not guarantee the efficacy of control of C. odorata, it is important that time lapse between follow-ups be kept as short as possible while treatments be done consistently. Furthermore, the result suggested that control of C. odorata requires maintaining dense forest cover and keeping high grass cover in case of tree less area.

Version intégrale (ITC)

Page publiée le 3 avril 2018, mise à jour le 13 octobre 2018