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RE: Guava Tree or Psidium guajava (Myrtaceae)
News of them being invasive is also news to me. There are a few Guava trees here on the farm, but they don't seem to affect the apple orchards. I will let the farm manager know. Blessings!
Apparently they do farm them in the Cape, people are asked to be on the look out for specific rust marks on leaves of trees, some alien trees may affect other trees in orchards. http://saforestryonline.co.za/news/myrtle-rust-spreading-in-sa/