![]() ![]() Too much nitrogen in the soil. This could be caused by excessive use of manure or other nitrogen-rich fertilizers. You can prevent this problem by using low-nitrogen fertilizers. On a fertilizer package, N-P-K is clearly stated (for example, 10-10-10). The first number is the percent by weight of nitrogen – look for a lower number to get less nitrogen. ![]() Insufficient calcium in the soil. You can treat this problem with lime (calcium carbonate) or other calcium supplements (such as dolomite lime, which also provides magnesium).***Note: you can jump ahead to the relevant section in the article with these links:Ī brown and black spot appears at the bottom of tomatoes on plants suffering from blossom end rot.įor more information, check out this article from Wikipedia on calcium deficiency and blossom end rot.Īccording to the University of Wisconsin Extension, blossom end rot is caused by a calcium deficiency in the plant. This can occur for several reasons: We’ll also give you some ideas about how to prevent this from happening in your garden. In this article, we’ll examine the many causes of black spots on tomato plants. Sometimes, these problems look the same, so it might take a little work to find the exact cause of black spots on your tomatoes. Black spots on tomato stems are caused by bacterial wilt, alternaria stem canker, & tomato pith necrosis. Black spots on tomato leaves are caused by early blight, late blight, bacterial speck, & sooty mold. ![]() So, why is your tomato plant turning black? Black spots on tomato fruit are caused by blossom end rot, buckeye rot, anthracnose, bacterial spot, & sunscald. If you see black spots on your tomato plants, you are not alone. You may find the fruit, leaves, or stems of tomato plants turn black during a growing season – luckily, the location of the black spots can help you to find the source of the problem. ![]()
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