Agri Kultuur September / September 2016 - Page 41

Three Ambrosia species are known to have naturalized in South Africa: A. artemisiifolia, A. psilostachya and A. tenuifolia. Ambrosia tenuifolia is known to occur only in the Eastern Cape and Ambrosia psilostachya has very finely dissected leaves resembling those of fennel. Of these three Ambrosia species it is most likely that famine weed could be confused with A. artemisiifolia due to their similar morphology and growth forms This document aims to assist people in distinguishing Parthenium hysterophorus (Famine Weed) from Ambrosia artemisiifolia, and is intended for use as a broad guideline only, as exceptions do occur due to the many factors that affect the growth and vigour of individual plants and populations. Map showing confirmed populations Parthenium hysterophorus Famine weed * The South African National Biodiversity Institute (SANBI) is mandated to conserve South Africa’s rich biodiversity. Its Invasive Species Programme, funded by the Department of Environmental Affairs, Natural Resources Management Programmes aims to reduce the threat of biological invasions through detection, identification assessment and management of invasive species that may be contained or eradicated. **most data sourced from the Southern African Plant Invaders Atlas (SAPIA). Acknowledgements Reshnee Lalla, South African National Biodiversity Institutes’ Invasive Species Programme (ISP) (r.lalla@sanbi.org.za), with inputs from Lorraine Strathie, Agricultural Research Council-Plant Protection Research Institute (ARC-PRRI). Acknowledgement to the ISP. Ambrosia artemisiifolia Common Ragweed