I am looking around in areas previously reported to be infested with cowpea Striga but what I am discovering is that the reported witchweed was instead Alectra vogelli which was infesting bambara nut (Vigna subterranean). I need to collect cowpea Striga and tobacco Striga from different areas and genetically characterize them as they are phenotypically similar but with high host specificity. The attached photo shows S. gesnerioides parasitizing Nicotiana tabacum.