Rose Black Spot Treatment. Here's how to treat and prevent it. Spots typically begin on the lower leaves and move upward.

Black spot disease is the scourge of rose growers.

Not only does it make the plant look unsightly, but it also causes the leaves to drop prematurely. They can appear as early as when the leaves first unfurl. Yellowed leaves on roses aren't attractive, and when they fall off, they leave a changing your gardening practices may not entirely prevent black spot, and they do not treat black spot if it's already rampaging through your garden. Black spots on roses are caused by a fungal disease called diplocarpon rosae.