Anthracnose

Anthracnose is another fungus that can attack your roses. While not as prevalent as blackspot, it can still be something to watch out for!

The first symptoms you'll see of this fungus include a yellowing of the leaves, and various spots appearing. The spots will usually be dark, either a grey or a reddish-brown. Later the spots may leave complete holes through the leaves, followed by the leaf often dying and falling off altogether. Occasionally, you will see this on stems as well. Its most common in the spring when conditions are damp and more ripe for fungal infections.

This fungus can be spread much like any other fungus. Most common infections close proximity to infected areas and by water. Its critical to prune and remove infected areas quickly to prevent contact with other non-infected leaves and stems. Also, proper watering can affect this fungus as well. Water early in the day so that the leaves can dry out completely.

If you do want to try and treat an infection, you can use the same fungicides for anthracnose that you would use for blackspot.