Rust of Stone Fruit

Tranzschelia discolor


A fungal disease that produces deep yellow angular spots, about 2 mm wide on the topside of leaves and a mass of rust red powdery spores opposite the spots on the underside of the leaf. In severe infections the leaves will fall prematurely reducing fruit production and exposing the branches and trunk to sunburn. Twigs and fruit can also be infected.

Species Affected:

Stone fruit.
Apricots, Nectarines, Peaches and Plums are most severely affected


Favoured by warm, wet weather.
Spores spread by wind.
Usually survives from one season to the next on twigs.

Life Cycle:

Origin and History:



Management and Control:

Prune infected twigs and branches.
Apply fungicides.

Related and Similar Species:


(McMaugh, 1985)


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