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Powdery mildew severity (0–5-scale) in plants of Rosa ‘Aga’ after 1, 3, and 6 weeks of growth with natural infection in greenhouses, and grown under six different light-emitting diode LED light treatments (Control—unlighted, R—red, B—blue, W—white, S1—RBW + FR with high R: FR and S2—RBW + FR with low R:FR. Average values (n = 30, ±SE) followed by different letters differ significantly according to Tukey’s test (p < 0.05).
