Abstract
This study aims to determine the intensity of leaf rust disease, growth and yield of chrysanthemum at the concentration and time of application of Paenibacillus polymixa biological agent (PPBA). The study used a randomized block design with a factorial pattern. The first factor, the concentration of PPBA with 4 levels (1%, 2%, 3%, 4%). The second factor, time of PPBA application with 3 levels (1,2,3 wap). The results showed that the concentration of PPBA and the interaction between concentration and time of PPBA application was not significant for all observed variables, but the time of PPBA application had a significant effect on the number of infected leaves and the intensity of the attack. The lowest intensity of attacks acquired in 1 wap 19.58% is still considered low category because previous PPBA applications will be able to suppress the pathogen of Puccinia horiana Hen and reduce the number of infected leaves on chrysanthemum. Applications 2 wap (32.68%) and 3 wap (32.94%) indicate that the intensity of the attack is caused by the delay of PPBA, microclimate, and high rainfall intensity. Therefore, the attack intensity is lower with faster PPBA application time and increases when application time of PPBA is slower.
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