RATHORE*, B.S. “Epidemiological Factors for Development Progression of Downy Mildew (Peronospora Alta) on Blond Psyllium (Plantago Ovata)”. Indian Phytopathology, vol. 61, no. 4, Nov. 2008, pp. 478-85, https://epubs.icar.org.in/index.php/IPPJ/article/view/12861.