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Japanese dodder(Cuscuta japonica)is a flowering,parasitic weed that causes major yield losses on crop and forest production.In present field study,the influence of Cuscuta on the growth and secondary metabolite of its host medicinal shrub Madagascar periwinkle(Catharanthus roseus)was investigated.Vegetative and reproductive growth of the host plant Catharanthus were measured at intervals from 0 to 60 days after inoculation(DAI),and content of three alkaloids,naturally produced by the host,in the host and parasite were measured by HPLC at intervals from 15 to 45 DAI.