* Roggero P, Ciuffo M, Dellavalle G, Gotta P, Gallo S, Peters D (1999) Additional ornamental species as hosts of Impatiens necrotic spot tospovirus in Italy. Plant Disease 83(10), p 967.
* Parrella G, Gognalons P, Gebre-Selassie K, Vovlas C, Marchoux G (2003) An update of the host range of tomato spotted wilt virus. Journal of Plant Pathology 85(4), 227-264.
------- Confirmed host.
* Pisani C, Patel PC, Rosskopf EN, Abbasi M, Aime MC (2019) First report of downy mildew caused by Plasmopara halstedii on Ageratum houstonianum in the United States. Plant Disease 103(11), p 2968.
* Greber RS, Klose MJ, Teakle DS, Milne JR (1991) High incidence of tobacco streak virus in tobacco and its transmission by Microcephalothrips abdominalis and pollen from Ageratum houstonianum. Plant Disease 75(5), 450-452.