bella, if you're still around, you might post this again in plant pests and problems, below. A lot depends on what kind of blight or canker you're talking about. I know there are cankers on the stems of plums that only require pruning. There is a canker that affects the trunks of peaches, plums and other related fruit that is different, and the recommendation is to destroy the tree. I had this on a peach once, and I cut the bark away from the infected areaand cut away the gall, and painted the wound with pine tar, a product that's actually for wounds on horses and such, but has medicinal properties. This was not a wild whim, I work with trees professionally, and was curious as to the antibacterial and other properties of this product. So far so good.

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Dave
Even my growlights are getting restless!