Caused by the fungus Septoria glycines. Present in most fields at some level ... Symptoms begin as small brown spots that can have a yellow halo around them, as spots coalesce the leaf may turn yellow ...

It seems most gardeners are struggling with tomato blight or septoria leaf spot or blossom end rot. The first step is knowing which problem the tomatoes have. Let’s start with Early Tomato Blight.

Warm, moist conditions make gray leaf spot worse. Again, in the fall, clean all tomato debris from the garden and dispose of it. Select resistant varieties. Septoria Leaf Spot is the most common ...

Two other fungal diseases, early blight and anthracnose, are also significant diseases in Illinois tomato fields. All three ...