References to a commercial product or trade name are made with the understanding that no discrimination is intended and no endorsement by the North Dakota Extension Service is implied.
The information given herein is for educational purposes only. Photos were made available under Creative Commons licenses specified by the photographers: Gerald Holmes, California Polytechnic State University at San Luis Obispo, and Bruce Watt, University of Maine,. Published in the NDSU Yard & Garden Report, July 21, 2014. Written by Tom Kalb, Extension Horticulturist, North Dakota State University. Varieties resistant to early blight are available. Next year, don’t crowd your plants in the garden. Staking can help to maximize air flow and sunlight in the planting.Īfter frost, remove all infected vines to prevent fungal problems next year. Mulch your plants this can serve as a barrier between your vines and the disease-infected soil. Irrigate in the morning so any water that gets on the foliage can dry before nightfall. Keep the foliage dry when watering to prevent the splashing and spread of fungal spores. Sprays can continue every 10–14 days if needed.
Chlorothalonil (Daconil, Bravo) and mancozeb (Dithane) are most often used. Chemical Action and Usages: Chlorothalonil is a organochlorine fungicide that is available in several different formulations and sold under the trade names of Daconil, Bravo and others. Protect the healthy foliage by applying a fungicide. Management strategies of both diseases are similar. Numerous lesions can appear on each leaf. It also starts from the soil and works its way up the plant. Septoria appears as tiny 1/8-inch brown spots with dark borders (bottom photo). Keep your eyes open for Septoria leaf spot disease ( Septoria lycopersici). Most tomato plants, infected or not, benefit from a light fertilization after first fruit set. Early blight is especially aggressive on pale, hungry vines. You will notice a pattern of brown concentric rings in the lesions (top photo).
Brown spots with dark borders grow to over ½ inch in diameter. mancozeb Bonide Mancozeb Flowable with Zinc Many vegetable diseases, including anthracnose, fungal leaf spots, downy mildew, early blight, gummy stem blight, late blight, scab, rust, and smut. This fungus comes from the soil and starts on the lower leaves. Spray early in the morning or late in the evening to avoid burning of foliage. The most active fungus on tomato vines is early blight ( Alternaria solani). Tomato vines are starting to suffer from disease. Chlorothalonil, mancozeb, or maneb offer the most broad-spectrum activity against the common tomato foliar fungal diseases: late blight, early blight.
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