Diagnose: Rhododendron Root Rot
Use these observations to decide what to check next.
Root trouble is possible when wilting persists in wet soil; a clean crown does not rule it out.
The first checks are soil moisture, recent watering or flooding, planting depth, and visible stem damage. These observations help narrow the problem without cutting healthy bark.
If the crown has no symptoms, fine roots still need assessment. UC IPM explicitly warns that feeder-root rot can cause similar wilting even when the root crown appears intact.
Discolored crown tissue can support suspicion of Phytophthora, while a white fungal sheet suggests another disease such as Armillaria. Neither a single cut nor the absence of a stain settles every case; an extension diagnostic service can advise on sampling before an irreversible treatment or removal.
Rhododendron leaf scorch overlaps in visible symptoms, so leaf-edge browning alone is not an exclusion test.