Tomato stems often develop small white or brown bumps on the stems. Plant disease-resistant tomato varieties, practice crop rotation, keep the beds free of weeds. The best defense against bacterial canker is prevention. Like late blight, there is no known cure for this disease. In the stems, it can be identified by brown spots or streaks in lesions. Once it’s discovered, it’s best to pull the plants from the garden.Īnother potential culprit is bacterial canker. Like many serious fungal diseases, Alternaria stem canker is difficult to control. Dark cankers form along the stem of the plant, slowing enlarging outwards in rings as the disease progresses. If the dark spot looks more like a lesion than discoloration, you may be dealing with Alternaria stem canker or bacterial canker.Īlternaria stem canker is not particularly common among homegrown tomato plants, but it’s not impossible to come across. Unlike early blight which can be resolved if discovered early on, any plants showing confirmed signs of late blight should be pulled from the garden and destroyed to prevent any spread to other plants in your garden. Dark black or purple spots spread from the leaves to the stems remarkably quickly, indicating the imminent demise of your tomato plants. Simply remove all infected leaves and apply a fungicide designed to tackle early blight. Early blight is unfortunately a common problem for tomato gardeners, but this comes with the benefit of easy treatment. The spots normally appear on the stem just above the soil line. Early blight, caused by the fungus Alternaria solani, is identified by dark brown or black spots on all parts of the part, including the stem. The first and most likely causes are early or late blight. Luckily, most causes for this common problem are treatable. As black spots are associated with rotting, finding a black spot on your plant can understandably cause serious alarm. Starting with the most panic-inducing problem, we have black spots or streaks along the tomato stems. The sooner you identify the problem, the sooner you can work toward getting your plant back in shape and ready for production. Take some time during your regular care schedule to check for these five tomato stem problems. Dense leaf growth and our focus on the fruits distract from this essential transport system that, along with the roots, makes fruit production possible. Tomato stem problems tend to go unnoticed until they are completely out of hand. When checking our plants for potential problems, we often overlook the center of the whole process – the stem. Problems are normally identified by the look of the plant – wilting branches or yellowing leaves. The unfortunate fact of tomato growing is that most gardeners will face a tomato plant problem at some point in the season.
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