Powdery Mildew~
Picture of leaf covered in mildew
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Description
Just as the name suggests, a white powdery fungus which grows mostly on the upper surface of leaves. It will occasionally spread to the underside and other parts of the plant. It prospers in dry soil conditions but where the overhead conditions are somewhat humid.
Visual Symptoms
Leaves, particularly of young infected plants, may turn yellow and become distorted.
Infected areas and indeed whole leaves will gradually die back and dry off.
If the plant is a Rhododendron the growth will still be powdery but may be a beige colour and may occur more frequently on the underside of the leaf.
Treatment and Control
Remove and destroy all infected parts of the plant including any foliage on the ground.
Spray with suitable fungicide. Products containing any of the following active ingredients will be effective:
- Bifenthrin and myclobutanil (for example ROSECLEARŪ 3)
- penconozole (for example SCOTTS FUNGUS CLEAR)
- mancozeb (for example BIO DITHANE 945)
- myclobutanil (for example BIO SYSTHANE FUNGUS FIGHTER)
- sulphur (for example VITAX YELLOW or GREEN SULPHUR)
~~~3415~3416~~