Gardening: The fungus among us makes maintenance essential for good tree health.

When it comes to the spread of Fusarium dieback, a disease that infects more than 100 species of trees, the picture changes. There is a complex of three different Fusarium fungi involved in Fusarium dieback. Moreover, these fungi are not spread on their own but rather by a tiny symbiotic beetle know as polyphagous shot hole beetle, a type of ambrosia beetle, which is no larger than a sesame seed.