Cedar-apple rust

cedar-apple rust
cedar-apple rust

CLASSIFICATION

Fungi, Basidiomycetes, Pucciniomycotina, Pucciniomycetes, rust, Pucciniaceae, Gymnosporangium, Gymnosporangium juniperi-virginianae

ABOUT

Cedar-apple rust is an infectious fungal disease caused by members of the Pucciniaceae family. Two hosts are required - cedar and apple. Its symptoms include bright orange or red leaf spots, woody galls, and swollen stems covered in an orange layer.

How to treat?

  • microscopeBiological

    • For cedar and juniper: you may remove and destroy the infected parts of the plant - remove infected branches with galls.

    • For apple trees and other plants in the Rosaceae family: rake and destroy the fallen leaves.

  • pillChemical

    • Using fungicides is not recommended. Trees and shrubs are usually tolerant to this infection and they are usually not seriously damaged.

    • If necessary, apply fungicide containing myclobutanil (GHS07: Harmful, GHS08: Health hazard, GHS09: Environmental hazard) (on apple trees).

  • syringeDisease prevention

    • Use resistant species and cultivars as well as healthy, certified seeds and seedlings.

    • Do not plant host species in one place (e.g. cedar, juniper, apple trees).

    • Avoid prolonged wetting of the leaves, which can be caused e.g. by overhead irrigation.

    • Disinfect tools, infected flower pots, and hands to avoid disease transmission.

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