Hands On Gardening - Septoria Leaf Spot

Septoria leaf spot is a fungus that affects plants like black-eyed Susans. It causes the leaves to turn black with spots on them.

Septoria leaf spot starts out as small specks on the leaves in the early spring. As the season progresses, the fungus spreads and the spots become larger.

In the fall, after the plants are done flowering, cut off all the foliage and dispose of it. This will help prevent the spread of the fungus. You can also make fungicide applications in the spring to further prevent the disease.

If you already have septoria leaf spot, you can take steps to control it. Remove any infected foliage and dispose of it properly. You can also make fungicide applications to help control the disease.

Good air movement is important in preventing the spread of septoria leaf spot. Spacing out your plants and giving them good air circulation will make a big difference in preventing the disease. Additionally, removing any plants that start to seed and get out of control will help control the spread of the disease.