This particular symptom is referred to as “firing” and can be helpful in diagnosing the problem. On larger, more mature plants, one side of the infected leaflet may die while the other side of the leaflet remains healthy and green as a result of the bacterial canker pathogen having invaded the internal tissues of the plant. As the disease progresses, brown streaking and cankering become more evident. Oftentimes, these symptoms are mistaken for physical damage caused by wind abrasion, drought, or improper nutrition. These spots are larger in size than those caused by bacterial speck.Įarly symptoms of bacterial canker on tomato transplants include small, tan “blister-like” lesions on the leaves and petioles. These spots may be surrounded by a distinctive and obvious yellow “halo.” Bacterial spot that occurs on tomato and pepper is not as easy to identify and results in spots or blotches on the leaves and stems that can vary in color from a medium brown to a dark brown or black. Bacterial speck causes small, dark-brown spots on tomato leaves. Some specific strains of the bacterial spot pathogen can also cause disease on peppers. There are three different bacterial pests that cause problems on tomatoes and they are commonly referred to as bacterial canker, bacterial speck, and bacterial spot. Fungicides that help to limit Alternaria early blight or Botrytis leaf blight won’t help against the bacteria that trouble tomatoes and vegetables. For instance, the products that may help to limit fungal tomato pests will not work against bacterial pests. While some control strategies are similar for fungal and bacterial pathogens, there are fundamental differences that shouldn’t be overlooked. A diagnosis from a plant pathologist in a clinic is the best way to proceed. Trying to “guess” what the problem is by matching pictures from books or the web can be misleading. Determining whether your plants have been invaded by a fungal or a bacterial pest should be a priority. Some of the spotting or blighting that you might encounter on your vegetable seedlings may be caused by fungal pathogens. But there are specific management tips for your day-to-day operations that can help to prevent, or at least minimize, spots, blights, and other disease problems.īacterial pathogens have long been a pest to tomato seedlings in the greenhouse and occasionally infect peppers. In fact, it can seem like the odds are stacked against you. Spots and blights on the foliage of vegetable transplants are annoying and difficult to halt.
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