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While diseases such as early blight and powdery mildew are already well-known by gardeners, they are appearing more frequently, especially for those in northern climates who are experiencing warmer weather than in prior years.

One of these diseases, early blight, primarily impacts tomato and potato plants; browning leaves are the first sign, and if left untreated, the blight can spread to the stem and other parts of the plant, eventually killing it.

A: When the lower leaves of a tomato plant are yellowing around the edges with scattered brown spots, this is likely caused by early blight, a fungal disease.

Both early blight and Septoria leaf spot are soil-borne fungi that overwinter in infested soil.

Two of the most common fungal diseases may, at first glance, look similar — and you may even have them both: Alternaria, or early blight, and Septoria leaf spot.