Oidium sp.

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What is Powdery Mildew (Ornamentals)

Powdery mildew is a fungus which spreads a white or ash-grey film over the upper and lower surfaces of the leaves of plants - usually the older leaves. Powdery mildew fungus favours high humidity and dry conditions. Water splash and air currents spread the spores of powdery mildew which grows on the surface of the leaf only

 

Symptoms

Appearance of a whitish film on leaves and buds. New growth is distorted and older leaves become blackened. Flower buds may fail to open.

 

Plants impacted

  • Roses
  • Crepe Myrtles
  • Dahlias
  • Zinnias
  • Calendulas
  • Sweet Peas

Recommended products

Yates Nature's Way Fungus Spray

Protects against a very wide range of fungal and bacterial diseases. It is formulated from copper and sulfur, two naturally occurring compounds.

Yates Rose Gun Spray Ready to Use

A systemic fungicide and contact insecticide, kills pests and mites on contact and systemically works from within the plant to control black spot, powdery mildew and rust on roses and ornamentals in the home garden.

Yates Fungus Gun Ready to Use

A broad spectrum fungicide that works systemically within the plant, providing both protectant and curative activity to prevent and control fungal diseases.


More articles

Powdery Mildew on Vegetables

Powdery mildew is a fungus which spreads a white or ash-grey film over the upper and lower surfaces of the leaves of plants-usually the older leaves.

Rust

Rust fungus is easily identified by the many orange or red pustules on leaves or stems which break open and release masses of spores.

Sooty Mould

Sooty mould is a fungal disease which presents as a black powdery substance coating plant leaves, stems and twigs usually accompanied by a sticky residue.

Downy Mildew

Downy Mildew is often more widespread in younger plants and is recognised by downy, whitish tufts or spores on the underside of the leaves.