Rust
Rust fungus is easily identified by the multitudes of orange or red pustules on leaves or stems, that break open and release masses of spores.
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Uredo rangelii
What is Myrtle Rust
Myrtle rust affects members of the Myrtaceae family, which includes pōhutukawa, rātā, mānuka, kānuka, ramarama, swamp maire and eucalypts. Young plants and soft new growth are most likely to be infected.
Symptoms
Can start with small purplish spots. Develops mature bright yellow, powdery spores on leaves and, sometimes, fruit. Leaves can become contorted and purplish-red pigmentation can occur. Soft plant material can die.
Plants impacted
- Pōhutukawa
- Rātā
- Mānuka
- Kānuka
- Ramarama
- Swamp maire
- Eucalypts
Powdery Mildew
A fungus that spreads a white or ash-grey film over the upper and lower surfaces of the leaves of plants - usually the older leaves.
Sooty Mould
Fungi that form a black, ashy-looking coating on plant leaves and stems. Sooty mould grows on sticky honeydew secreted by insects, so it's a symptom of a sucking insect problem. Often accompanied by ants.
Downy Mildew
A fungal disease common in young vegetable plants, identified by yellow spots on top of leaves, and downy, whitish tufts or spores on the underside of the leaf.
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