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    Farming & Crop Protection Rust (prune and plum)

    Rust (prune and plum) [Tranzschelia pruni-spinosae]

    The premature leaf fall adversely affects fruit quality and flower development.

    overview

    Rust (prune and plum) - image 1

    Rust (prune and plum) - image 1

    Rust (prune and plum) - image 2

    Pest Profile

    • Symptoms & Diagnosis

      Occurence

      Initial occurrence in mid-July. The fungus reproduces through brown summer spores formed on the undersides of the leaves. Although plum rust only livers of live plant material unless it produces resting spores it therefore lives on other host plants when the plum trees are dormant.

      Pattern of damage

      Small yellow spots on the upper sides of the leaves; (Picture 1) initially brown, eventually black pustules on the undersides of the leaves (Picture 2). Severely infected leaves turn brown and are shed.

      Treatment

      Combat

      Control with fungicide sprays must be started immediately after the first symptoms of infection appear. Removal of contaminated leaf litter.