![]() Remove all plant debris at the end of the season. ![]() Juliet, Legend, Manyel, Old Brooks, Tommy Toe, etc.). Grow early blight resistant cultivars (e.g. heirlooms), make sure the fruit is disease-free. If collecting your own seed from open pollinated cultivars (e.g. Resistance to certain chemicals or entire chemical groups is becoming more of an issue and rotation can help to maintain the efficacy of these products over a longer period of time. The best strategy to combat early blight is prevention. Wounds frequently develop into a bulls-eye type spot. The wounds grow and can damage an entire tomato fruit. It causes brown wounds on foliage, stems and fruit. Early blight is cause by different fungal pathogens, notably Alternaria solani and Alternaria tomatophila. Remember, it is critical to rotate chemical families in your fungicide program. There are different types of blight that attack garden-grown tomatoes. For a product list and efficacy regarding anthracnose and early blight click here. For a list of products and their efficacy on late blight as protectants, curatives and antisporulants click here. Once you begin to see late blight in the crop, adding products that are better as curatives is imperative. Although mancozeb is currently an important player in fungicide programs, tomato growers do have other options available.įor best control it is always good to start with preventative or protectant fungicides once environmental conditions are conducive to disease development and before symptoms appear. This will ultimately have an effect on how we control diseases, including anthracnose, early blight and, most importantly, late blight. The Pest Management Regulatory Agency recently announced that it will be cancelling the use of the group M3 chemicals mancozeb and metiram in a wide range of crops, including field tomatoes. In 2020 products like Manzate, Penncozeb, Dithane and Polyram will no longer be available for sale and in 2021 use will be banned completely.
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