Mycorrhizae for dogwood?
A tree specialist has diagnosed my elderly Cornus florida (>35 years old) with anthracnose and is treating it with a fungicide. He has also recommended treating the root area with mycorrhizae to promote strong growth. From what I read, this generally is unnecessary, as mycorrhizae should be present in the soil already. However, it does seem to be recommended following fertilization and/or treatment with insecticides/fungicides. What do you think?
You are correct the mycorrhizae application most likely is not necessary for this situation even though the tree is being treated with a fungicide.
We have noticed that dogwoods are having fewer problems with discula anthracnose but more problems with powdery mildew and spot anthracnose or Elsinoë. Please see the following information,