Recently, reports of root and collar rot in Eucalyptus nitens in South Africa have been increasing. A research paper published earlier this year entitled “Hybrid vigour in Eucalyptus increases resistance against Phytophthora root rot” found the severity of this disease is substantially lower among interspecific hybrids of E. grandis × E. nitens compared to purebred E. nitens.
You can read more on this here – https://www.woodbizafrica.co.za/april-2023-issue-25/#april-2023-issue-25/36/