Persistence Patterns and Intensity of Leaf Rust Disease in Chrysanthemum Production Systems

This study aims to determine the conditions of chrysanthemum cultivation, the pattern of distribution of chrysanthemum leaf rust disease (persistence), the development of disease symptoms, and the intensity of chrysanthemum leaf rust disease at the cut flower production center in the Special Region of Yogyakarta (Sleman and Kulonprogo). The results showed that chrysanthemum farming in DI Yogyakarta is cultivated on a flat to hilly topography, and the cultivation method is simple and conventional in a plastic house (gauze). Rust disease caused by Puccinia horiana is found in Sleman and Kulonprogo Regency with varying degrees of severity. Chrysanthemum rust disease has random disease distribution which means that the cause of the disease is dispersed by the wind or by seeds. P. horiana spores are dispersed by the wind and can be caught with Kiyosawa-type spore traps at an altitude of 0.5-1.5 m from the soil surface. The highest intensity of chrysanthemum leaf rust disease is found in dense/lush plantings in susceptible varieties in Pakem Sleman at an elevation of 900 m above sea level by 85% and Samigaluh Kulonprogo at an elevation of 650 m above sea level by 58%