Tree diseases of unknown etiology under current investigation.
| Disease | Host | Reference |
|---|---|---|
| Maple variagation | Acer saccharum | Gotlieb, unpublished data |
| Persimmon mosaic | Diospyrus virginiana | Millikan et al., unpublished data |
| Sassafras bunch | Sassafras albidum | Millikan et al., unpublished data |