Figure 1.

Diversity of external (A–D) and internal (E–I) trunk disease symptoms on Citrus species in Iran (A) a severe dieback on Citrus sinensis; (B) two cankers on a trunk of a C. sinensis tree indicated by arrows; (C) an extended canker on the branch of Citrus aurantifolia indicated by arrow; (D) gummosis on Citrus limetta; (E) cross-section of a healthy branch of C. aurantifolia; (F) central necrosis on C. sinensis; (G) Co-occurrence of brown wood streaking (black arrow), wedge-shaped necrosis (white arrow) and irregular wood necrosis (red arrow) on C. sinensis; (H) Arch-shaped necrosis on C. aurantifolia; (I) a young wedge shaped necrosis on Citrus reticulata; (J) Co-occurrence of wedge-shaped necrosis is indicated by the white arrow and black spots are indicated by the black arrow on the C. sinensis.