Figure 2.

Symptoms of bot gummosis on lemon trees: (A,B) cankers with abundant gummous exudate on scaffold branches of ‘Femminello Siracusano 2Kr’ lemon (Citrus × limon) tree; (C) typical tan to brown discoloration of the wood beneath the bark of a canker; the discolored wood is visible after removing the bark; (D) gummous canker on a branch of lemon tree; (E) old canker with bark scaling at the level of main branch scaffolding, expanding upward to the secondary branches and downward to the grafting line between the scion and the rootstock.