Citrus blight disease

All pictures by S.M. Garnsey USDA-ARS, Orlando (US)
(click on the images to enlarge them)

Typical citrus blight symptoms in Florida on Valencia sweet orange. Note wilting in leaves and presence of off season bloom.

Close up of wilting symptoms in
early stages of blight.

More advanced wilting.

Advanced symptoms of citrus blight. Tree has extensive dieback and is now producing interior shoot of new growth. Blighted trees usually do not die, but remain in this chronic stage.

Zinc defficiency associated with citrus blight. Normal flow of
water and zinc from root to canopy is disrupted by blight,
and zinc actually accumulates in the wood of blighted trees.


Close up of zinc defficiency associated with citrus blight.	Diagnostic of citrus blight. Trunk from a healthy tree injected with a dye on two sides and a trunk from a sectored early stage bligth tree injected on the wilted side and on the apparently normal side. Note lack of dye in blighted side.

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