. . . . . . . . . "Erysiphe trifoliorum" . . "Trifolium dubium" . . "Peter de Lange. 2017. Erysiphe trifoliorum host Trifolium dubium. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/9059181> on 05 Apr 2018." . . . . "http://iNaturalist.org is a place where you can record what you see in nature, meet other nature lovers, and learn about the natural world." .