5/3/2018 Differences between AWA and SA Chromolaena http://www.arc.agric.za/arc-ppri/Pages/Weeds%20Research/Chromolaena/Differences-between-AWA-and-SA-chromolaena.aspx 1/2 Sign In Home Information Hub Staff Portal Plant Protection Research Products and Services Media Training Courses Research Focus Search... Differences between AWA and SA Chromolaena What is Chromolaena? Biological Control Workshops Newsletters Expertise Other invasive alien plants within the Eupatorieae Bibliography Useful links Character AWA SA Leaves Fine hairs giving a soft texture, particularly to younger leaves Grey-green to dark green Young leaves often purple, especially when growing in sun Leaves often larger, more prominently ribbed Largely smooth Yellow-green when growing in sun, dark green in semi-shade Young leaves often red, especially when growing in sun Leaves generally smaller Stems Hairy, grey-green to dark green Largely smooth, yellow-green Flowers Pale lilac Broader individual flowers Bracts with sharp tips, lax around flower-head White Narrower individual flowers Bracts with rounded tips, tight around flower-head Home > Plant Protection Research > Differences between AWA and SA Chromolaena Appendix 3-12
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5/3/2018 Differences between AWA and SA Chromolaena
Crown Larger plants have underground ‘corm’ structure
‘Corm’ less prominent
Growth form Branches more lax More upright growth form, especially young growth in densestands
Ecology May be more fire resistant, resprouting from crown
May be more adapted to tropical conditions
May be more susceptible to fire. Burning frequently kills largeplants
May be more cool tolerant (Kriticos et al., 2005)
Photographic acknowledgementsAll AWA chromolaena biotype photos courtesy of Colin Wilson, except for photo of corm from Joshi (2006). All SA chromolaena biotype photos courtesy of ARC-PPRI.
ReferencesKriticos, D. J., Yonow, T. and McFadyen, R. E. (2005) The potential distribution of Chromolaena odorata (Siam weed) in relation to climate. Weed Research 45: 246-254.
Joshi, C. (2006) Mapping cryptic invaders and invasibility of tropical forest ecosystems: Chromolaena odorata in Nepal. Dissertation, International Institute for Geo-information Science & Earth Observation, Enschede, the Netherlands.
Zachariades, C., Day, M.D., Muniappan, R. and Reddy, G.V.P. (2009) Chromolaena odorata (Asteraceae) and its biological control. In: Muniappan, R., Reddy, G.V.P.,Raman, A. (Eds.), Biological Control of Tropical Weeds using Arthropods. Cambridge University Press, Cambridge. pp. 130-162.
