This is similar to yellow vein chlorosis which is caused by nitrogen deficiency. Under humid conditions, white mycelium is produced on rind surface. Infected fruit prematurely fall from the tree. All cultivars may be affected with early season varieties showing greater susceptibility. Bacteria are produced under moist conditions and dispersed by windblown rains.
Bacteria enter leaf stomates or wounds on leaves, twigs or fruit.
Citrus canker reduces yields, fresh fruit quality, and increases leaf defoliation. Citrus canker lesions on fruit Footnotes 1. This document is HS-798, one of a series of the Horticultural Sciences Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Published March 2001. For information on obtaining other extension publications, contact your county Cooperative Extension Service office.