Everything about Powdery Mildew totally explained
Powdery mildew is a
fungal disease that affects a wide range of plants. Powdery mildew diseases are caused by many different species of fungi in the order
Erysiphales. It is one of the easier diseases to spot, as its symptoms are quite distinctive. Infected plants display white powder-like spots on the leaves and stems. The lower leaves are the most affected, but the mildew can appear on any part of the plant that shows above the ground. As the disease progresses, the spots get larger and thicker as massive numbers of
spores form, and the mildew spreads up and down the length of the plant.
Powdery mildews of various plants
Powdery mildew of grape
Erysiphe necator (or
Uncinula necator) causes powdery mildew of grapes. It produces common odors such as 1-octen-3-one and (Z)-1,5-octadien-3-one
(External Link
).
Powdery mildew of wheat and barley
Blumeria graminis, the fungus that causes powdery mildew of grasses, can persist between seasons in wheat stubble that's left in the field, or in wheat that's left to overwinter. It thrives in cool humid conditions. Controlling the disease involves eliminating those conditions as much as possible. Wheat plants shouldn't be overcrowded in the field. This allows better air circulation among the lower parts of the plants, which lowers the humidity levels.
Nitrogen fertilizers encourage lots of leafy growth, and in farming systems that use them they should be used sparingly to control powdery mildew. Crop rotation with non-host plants is another way to keep mildew infection to a minimum. Reducing splash from contaminated soil also helps control spores. Chemical control is possible with anti-fungals such as
triademefon and
propiconazole. Some farmers are experimenting with spraying plants with waste milk, with varying degrees of success.
Powdery mildew of onions
The fungus causing powdery mildew of onions is
Leveillula taurica (also known by its anamorph name,
Oidiopsis taurica). It also attacks the
artichoke.
Further Information
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