Leaf spots are usually 1/16 inch, and dark. Organic growers may find that fungicides that contain the active ingredient copper may help to reduce disease severity.īacterial spot of tomato has been observed across Indiana this summer. See the MW Vegetable Guide for details on rates, application instructions and formulation differences. Systemic fungicides include Aprovia Top ®, Cabrio ®, Fontelis ®, Inspire Super ®, Luna ®, Priaxor ®, Quadris ®, Revus Top ®, Rhyme ®, Tanos ® and Zing ®. Contact products include fungicides with the active ingredient chlorothalonil (e.g., Bravo ®, Echo ®, Equus ®, Initiate ®) and mancozeb (e.g., Dithane ®, Manzate ®, Penncozeb ®). Fungicides that are likely to be effective against these diseases are listed in the MW Vegetable Production Guide. However, there are a few varieties with resistance to Early blight. Currently, no commercial varieties have resistance to Septoria leaf blight. Septoria leaf blight of tomato.Ĭrop rotations of 3 to 4 years and fall tillage are important management decisions for both diseases. Both diseases usually cause the lower leaves of the plant to become necrotic since older leaves tend to be more susceptible to these diseases.įigure 2. In addition, Septoria lesions have small, dark fungal structures in the lesions which may be seen with a 10X hand lens (Figure 2). Septoria leaf blight lesions are also round but lack concentric rings. The lesions tend to be gray-brown and are, as mentioned above, more common on the lower leaves of the plant. The most likely cause of this complaint is one of these diseases.Įarly blight causes relatively large round necrotic lesions with concentric rings (Figure 1). One of the most common complaints I get about tomatoes is something like this….’my tomatoes are turning brown from the ground up’. Together these diseases are probably the most common diseases of tomatoes in the field. And the management for these diseases is similar. Listed below are select foliar diseases of tomato.Įarly blight and Septoria leaf blight-These diseases are listed together because, from a few paces away, the diseases appear similar.
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