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Tomatoes are susceptible to more than three dozen different disease. However, you will most likely only have to deal with two to three main diseases in your area. some diseases are soil-borne, some can be spread by seed, and others through the air or water. Disease-resistance has been bred into many newer tomato varieties- some open- pollinated and some hybrids. Many heirlooms are very susceptible to common disease, though a few offer resistance to a particular disease. Keeping your tomato plants healthy and free from tomato disease that can plague the plant leaves is a top priority for all gardeners. As your plants grow, watch for tomato plant disease such as tomato wilt that can manifest themselves as fungi, bacteria, or viruses. When autumn comes if you have had any tomato plant disease problem at all extract the entire plant.
The most important step to take to prevent tomato disease are to maintain good soil conditions, choose and care for hardy cultivars, manage their water well, and deal with disease when its first shows itself. Get a soil test. Good gardens begin with healthy soil. A soil test will let you know your soil’s PH level and essential nutrients levels.