Toxic Cucumber

Magnolia acuminata is listed as a host for this condition, but no detailed information about symptoms or management exists. Further documentation is needed to understand this disease's significance in PNW ornamental plantings.

Remove affected material as you find it and clean up any fallen debris where toxic cucumber spores can overwinter. Improve air circulation around susceptible plants through selective pruning. Avoid overhead irrigation during vulnerable growth periods. If the problem is persistent, your local Extension office can recommend current fungicide or bactericide options for your specific situation.