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Blueberry (Vaccinium corymbosum)
Cranberry (Vaccinium macrocarpon)
Cause There are very few reports of problems on this plant, most likely due to little interest rather than to lack of problems. The OSU Plant Clinic has had three samples from the 1950s to the 1990s. One was diagnosed with frost damage; the two others had Phytophthora root rot. Growers in Oregon have mentioned a twig dieback. Rust has been found in Vermont and a shoot gall in Alaska. Reports from Europe indicate a pH of 4 to 4.5 is needed and that the crop does not do well under high nitrogen. Under high nitrogen, plants had dieback that resembled fungal problems, and in some cases the plants died. It is unclear whether the high nitrogen was related to high soluble salts in the root zone or to increased susceptibility to winter injury, both of which could result in the symptoms observed.
Reference Polashock, J. J., Caruso, F. L., Averill, A. L., Schilder, A., and Press, A. P. S. eds. 2017. Compendium of blueberry, cranberry, and lingonberry diseases and pests. APS Press, American Phytopathological Society.