Fungi & diseases - Plant Pests

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Ralstonia solanacearum

Ralstonia solanacearum, this bacterium causes a wide range of symptoms. Continue reading

Ramularia rhei, fungus that thrives under cool, humid conditions.
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Red stele is a fungus that thrives in cold and wet winter weather. Continue reading

Rhizoctonia is a soil fungus that causes a wide range of plant diseases.
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Rhododendron Blight is caused by a fungus: flower buds do not open, turn brown and rot under the influence of rain.
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Rose black spot: This fungus causes the characteristic star-shaped spots on roses and laurel.
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Rose rust, this fungus causes the brown-black fungal spots on the leaves of roses in autumn and winter.
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Many fungi on plants are called “rusts”. However, one rust is not the other: asparagus rust (Puccinia asparagi), Bean Rust (Uromyces appendiculatus – Uromyces phaseoli), Violet Bramble Rust (Phragmidium violaceum), hypericum rust (Melampsora hypericorum), leek rust (Puccinia porri), Coleosporium tussilaginis, Tongues of Fire (Gymnosporangium clavariiforme), rose rust (Phragmidium mucronatum), leaf spot (celery) (Septoria spp), spruce needle rust (Chrysomyxa) and white rust (Albugo candida).