Scientific name: Xanthomonas axonopodis pv. citri
Causal organisms: Bacteria
Affected plant stages
Seedling to reproductive stages
Affected plant parts
All above ground parts
is a bacterial disease of citrus that causes premature leaf and fruit drop.
A newly infected leaf has white spongy spots that will later turn gray or tan that finally erupt into a typical crater-like formation. The spots have oily margins
or yellowish rings. The cankers can be seen on both sides of the leaf. Old cankers sometimes fall out, leaving behind a shot-hole effect.
On fruit, the cankers appear scab-like or corky but without the yellow halo (ring). Infected fruits are unlikely marketable.
Conditions that favor development
- Strong winds and wind borne rain
- Citrus psyllids, people, birds and animals, farm equipments that carry the bacteria
- Movements of infected plants or plant parts
There is no effective control on citrus canker, except to pull out the infected tree and then burn it. Also, control citrus psyllids.