Powdery Mildew
Leaf covered in Powdery Mildew
Infected potato crop
Description
Powdery Mildew, just as the name suggests, is 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.
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 fungal 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
General tips
Remove and destroy all infected parts of the plant including any foliage on the ground.
Spray with a suitable fungicide
Products containing any one of the following active ingredients will be effective: Myclobutanil and bifenthrin, for example RoseClear 3 Gun! and RoseClear 3, myclobutanil, for example FungusClear 2 Gun! or triticonazole, for example FungusClear Ultra. Continue spraying at fortnightly intervals throughout the season.
Spray with a natural fungicide
Products containing sulphur, for example Nature’s Answer Natural Fungus & Bug Killer. Continue spraying at fortnightly intervals throughout the season.
See also:
Related products:
- RoseClear 3
- RoseClear 3 Gun!
- FungusClear Ultra
- FungusClear 2 Gun!
- Nature’s Answer Natural Fungus & Bug Killer
Always read the label. Use pesticides safely.
Chemical Information
Children, Pets, Wildlife
Information on usage of pesticide when children, pets and/or wildlife are a consideration.
Chemical Usage, Storage, Disposal
Important advice on using chemicals in the garden, chemical storage and safe disposal.
