* Ferreira MA, Sousa ME (2011) Hosts and Distribution of the Spider Mite Tetranychus evansi (Acari: Tetranychidae) in Portugal. Hale, C., Xxviii International Horticultural Congress on Science and Horticulture for People, Leuven 1, Int Soc Horticultural Science, (917): 133-136.
* 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.
* Marchi G, Cinelli T, Rizzo D, Stefani L, Goti E, Della Bartola M, Luvisi A, Panattoni A, Materazzi A (2015) Occurrence of different phytoplasma infections in wild herbaceous dicots growing in vineyards affected by bois noir in Tuscany (Italy). Phytopathologia Mediterranea 54(3), 504−515.
------- As Picris echioides.