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Bacterial diseases are often difficult to diagnose as they look very similar to fungal diseases. One of the main distinguishing features is that bacterial spots usually have a yellow halo (A, on naranjilla) around the outside of the spot. As the tissue within the spot dies, it can fall out creating a shothole-pattern that looks very similar to chewing insect feeding. Bacteria also causes plant symptoms such as cankers (B, on plum tree), galls (C, on grape), or spots that look wet or oily. Oozing plant sap can also indicate a bacterial infection in some situations.