Tan-colored spots with a darker brown ring on rose leaves can indicate a fungal issue. Two common culprits are rose anthracnose and black spot. Anthracnose appears in spring as small reddish-brown circular spots that eventually turn gray and fall out, leaving a shot-hole appearance. Black spot emerges in early summer as larger black spots with fuzzy edges and a yellow halo; spots may merge into large patches.
Apply a fungicide such as Ortho RosePride with Funginex to control both diseases. Follow label instructions for best results.
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