The ulcer base at the left shows loss of overlying squamous epithelium with only necrotic debris remaining. 左邊潰瘍基底面缺少鱗狀上皮僅存有壞死的碎片。
The results showed that the prime symptoms of the TPD include laticifer necrosis and cambium-like meristem formation that occurs around the necrotic laticifer in the inner bark. 結果表明該病的基本癥狀是在樹皮內層發生乳管壞死和在壞死的乳管周圍產生形成層狀分生組織。