Unfortunately, is is a concern. The fungi that attacks the decaying roots, also migrates throughout the surrounding soil and affects some types of plants located there.
In my experience, it apparently did little or no damage to any woody plants. Azaleas, Gardenias, Ferns and Hostas appeared to suffer no damage, so your existing plantings may be safe.
It did affect my Asarum collection and killed hundreds of them. Only 3 survived. I consulted a UGA Mycologist(retired) and was informed that there was no known fungicide
that was effective for treatment. He recommended that the area be left fallow(not planted) for 3-4 years, during which time the fungi would again become inactive(but always present).
I think any plant with a woody root would be unaffected, but those with succulent rhizomes would be at risk, until the fungi subsides.
Rb

Well, the crape myrtles were there for a year before the tree was cut down, so I hope they are OK. Wonder if junipers, cotoneasters and lantana have woody roots?

I'm not too sure anything other than brush be gone will kill the plants you list. They are some of the strongest of the strong among shrubs and perennials.

bumblebeez -- That's what I was hoping and why I chose them. Not because of the dead tree, but because of the dry conditions out there. Well, I will watch them and hope for the best!