Tomato plant rust

Asked May 15, 2020, 10:23 AM EDT

What is on my tomato plants? Can you tell me how to treat them?

Oklahoma County Oklahoma

1 Response

This is likely Septoria leaf spot, a common fungal disease of tomatoes during humid, wet conditions. There are several fungicides labeled to control Septoria leaf spot available in the garden centers. Applications are generally made every 7 to 14 days for best control, but be sure to follow product label directions. Here is a link to a fact sheet that will provide additional tips for control of this disease as well as other fungal diseases of tomato -