![]() ![]() (54 C.) water for 25 minutes prior to planting. To prevent infection, sanitize equipment with a bleach solution and soak seeds in 130 degrees F. The bacteria Clavibacter michiganensis is the culprit here and it survives indefinitely in plant tissue. The lesions can appear anywhere on the plant. ![]() It is readily apparent on older plants as brown streaking and dark lesions. However, Alternaria resistant varieties of tomatoes are available.īacterial canker is another tomato stem disease that causes black spots on the stems of tomato plants. In the case of Alternaria stem canker, unfortunately, there is no treatment. These cankers eventually enlarge, resulting in the death of the plant. Brown to black lesions develop at the soil line. ![]() This fungus either already lives in the soil or spores have landed on the tomato plant when infected old tomato debris has been disturbed. Amongst these is Alternaria stem canker, which is caused by the fungus Alternaria alternata. There are a number of fungal diseases that result in a stem turning black on tomatoes. Help, the Stem is Turning Black on My Tomatoes! What causes black stems on tomatoes? If your tomato plant has black stems, don’t panic it’s more than likely the result of a fungal tomato stem disease that can easily be treated with a fungicide. One day your tomato plants are hale and hearty and the next day they’re riddled with black spots on the stems of the tomato plants. ![]()
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