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Chromolaena odorata is an Asteraceae with ill-fated consequences in some regions of Cameroon because of its high capacity of spreading and invasion.A study realized between Mabele and Meiganga, in the forest-savanna transition zones located on the right bank of the river Lom, concerns the spreading and the regeneration of C. odorata. The worry aroused after the laying of the pipeline is that the building works should have favoured the spreading of this Asteraceae which highly reduces pasture zones knowing that it is a breeding zone par excellence. The aim of this study was to demonstrate that this species was existing in this huge region which goes from the Central Africa Republic to Nigeria, quite before the beginning of the Chad-Cameroon pipeline building works in 2002.The inversion of soils’ polarity would have probably brought about the burying of some C. odorata’s spores. The study of the transect realized in the Mabele-Meiganga area indicates that two generation types of C. odorata coexist on the area: on areas that are not disrupted by the building construction work, are located very robust old stumps of C. odorata which easily reach two meters height; and on the ROW (Road Of Way), are located young stumps of this species with very fragile and willowy stems. Knowing also that C. odorata is pioneer species; its presence here seemed natural because it has been later replaced by typical forest or savanna’s species. This study shows that C. odorata’s density decreases as one goes along from the forest to the shrubby or grassy savanna. Although the pipeline building works should have favoured the burying of this Asteraceae’s spores, its presence should be linked to a climate zonation promoted by the C. odorata’s fact is also a pioneer species. This study shows that the impact of the Chad-Cameroon pipeline building works would probably be negligible.

Origin and propagation of Chromolaena odorata (L.) king and robinson (Asteraceae) between Mabele and Meiganga in the North of Cameroon