Your photo and description indicate Septoria leaf spot, which is very common on Rudbeckia and is prevalent in Illinois. The disease begins on lower leaves and progresses up the plant but does not ...

Black spots on tomato leaves are usually caused by fungal diseases like Septoria leaf spot or early blight, which thrive in warm, humid weather and can reduce yields or kill plants if untreated. Treat ...

If the leaves on your tomato plants look like they are trying out for a part as a Dalmatian pup in the school play, trouble lies ahead. Caused by fungal infections, if the black spots spread, they can ...