Common Sweet Cherry - Bacterial Canker

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Thumbnail of Bacterial Canker Bacterial Canker (bacterium - Psuedomonas syrinigae pv. syringae): This bacterium causes cankers, gummosis, and shoot blight (photo). Sunken lesions appear in the spring with gummosis. Cracks and cankering follow, resulting in a girdled stem. The foliage becomes yellow, curled, and withered. Wet spring weather can result in shoot blight and a small angular leafspot. (photo)This is usually only a problem in young orchards. Use resistant F12-1 Mazzard rootstock. Remove girdled branches. Spray with copper hydroxide in October and January. This bacterium also attacks peaches. See the peach section for more detail.