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Synonyms:
White Mold, Fungal Growth, Mildew Fungus, Plant Fungus, Powdery Fungus

Powdery mildew is a white powdery growth that forms on the surface of the cannabis leaves. The fungus first appears as small bumps on the upper side of the affected leaves, and if left unchecked it can extend to the petioles, stems and finally the buds, completely destroying the resin and crippling the plant entirely. Also known as Oidium or White Mold, the pest affects both indoor and outdoor cannabis. It is necessary for farmers to take preventative measures from the beginning to keep powdery mildew at bay.

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Merriam-Webster Online Dictionary
powdery mildew (noun)
1.
an ascomycetous fungus (family Erysiphaceae) producing abundant powdery conidia on the host
2.
a plant disease caused by a powdery mildew
Powdery Mildew (Wikipedia)

Powdery mildew is a fungal disease that affects a wide range of plants. Powdery mildew diseases are caused by many different species of ascomycete fungi in the order Erysiphales. Powdery mildew is one of the easier plant diseases to identify, as the signs of the causal pathogen are quite distinctive. Infected plants display white powdery spots on the leaves and stems. This mycelial layer may quickly spread to cover all of the leaves. The lower leaves are the most affected, but the mildew can appear on any above-ground part of the plant. As the disease progresses, the spots get larger and denser as large numbers of asexual spores are formed, and the mildew may spread up and down the length of the plant.

Powdery mildew
Example of powdery mildew (right) along with Downy mildew on a grape leaf
Causal agentsSpecies of fungi in the order Erysiphales
Hostsplants

Powdery mildew grows well in environments with high humidity and moderate temperatures; greenhouses provide an ideal moist, temperate environment for the spread of the disease. This causes harm to agricultural and horticultural practices where powdery mildew may thrive in a greenhouse setting. In an agricultural or horticultural setting, the pathogen can be controlled using chemical methods, bio-organic methods, and genetic resistance. It is important to be aware of powdery mildew and its management strategies as the resulting disease can significantly reduce important crop yields.

Powdery mildew on a recently infected plant.
Powdery mildew growing on a leaf (magnified)
Powdery mildew growing on a leaf (high magnification)
Powdery Mildew (Wiktionary)

English

Noun

powdery mildew (countable and uncountable, plural powdery mildews)

  1. A mildew affecting many important food crops, caused by fungi of the order Erysiphales.

Translations

Further reading

  • powdery mildew on Wikipedia.Wikipedia
  • Erysiphales on Wikispecies.Wikispecies
  • Category:Erysiphales on Wikimedia Commons.Wikimedia Commons
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