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Downy mildew on roses is triggered by the pathogen Peronospora sparsa. As the illness progresses, the leaves take on a warped look with purple spots. These spots then sporulate and, in the final stages of the disease, turn light brown or white. Peronospora and Plasmopara species are specifically unsafe for most gardeners. Bremia and Basidiophora are also problematic, specifically on ornamental plants. In the field, the benefits did not show significant differences involving the low and high DS stages in the visible range only slight variations have been observed. On the other hand, that minor variations in the spectral reflectance...