A canker from the bacteria Pseudomonas syringae has developed in this young cherry tree. Photo by Ken Johnson, OSU With copper bactericides failing in some areas to control bacterial canker (Pseudomonas syringae) in cherries, growers will have to adopt an integrated approach, says an Oregon State University plant pathologist. Bacterial canker is the most important disease of sweet cherries and the number-one killer of young sweet cherry trees in the Pacific Northwest. In higher rainfall districts, such as Oregon’s Willamette Valley and Hood River area, tree losses as high as 75 percent have been reported in young orchards. In drier […]