ABSTRACKThis study aims to determine the symptoms of disease and the incidence of white rust inchrysanthemum plants in Kakaskasen II, Tomohon City. This research was conducted at theGreen House of chrysanthemum farmers in Kakaskasen II Village, Tomohon City in July untilSeptember 2020. The results of observations of symptoms of attack and incidence of rust diseasePuccinia horiana on chrysanthemum plants in Kakaskasen II, Tomohon City from the firstobservation to the last observation tend to remember with an average incidence of disease attackin Green House A is 45.90% and an average incidence of white rust disease in Green House B is36.86%.Keywords: White Rust Disease, Chrysanthemum Plants