Powdery mildew on hazelnuts: causes, symptoms, prevention

Hazelnut powdery mildew is one of the common diseases that affect hazelnut plants, affecting the quality and productivity of the crop. In this article on your site WORLD OF PLANTS, we will learn about the symptoms of this disease and how to combat it effectively to protect hazelnut trees.

What is powdery mildew on hazelnuts?

Powdery mildew is a common fungal infection of most trees and ornamental shrubs. The infection is often caused by excessive watering of plants, poor soil drainage, or high humidity around the plants. The causative agent is the fungus: Erysiphe polygoni

Symptoms and damage of powdery mildew on hazelnuts

Symptoms of powdery mildew on hazelnut leaves (A and B) and fruit clusters (C); conidia (d), bar = 20 µm; Casmuthium (e), bar = 20 µm; Extensions (f), bar = 10 µm; asci and ascospores of Erysiphe corylacearum (g), bar = 20. (Image at the end of the article)

1. White, flour-like spots on the leaves and stem relative to the upper and lower surfaces of the leaf, and the infection is more evident between the leaves than the branches.
2. Overcrowded branches and dense foliage help mold spread quickly throughout the garden.
3. The disease usually appears in summer and reaches its peak in late summer.
4. Over time, these patches of fungal growth may darken and form small, round, proliferative structures called cleistothecia.
5. They begin in the form of circular structures with a whitish vertical size, then turn yellow-brown and finally turn brown or black.

Prevention and treatment of powdery mildew on hazelnuts

• The leaves should not be used in garden compost or for any gardening activity.
• The best way to reduce the chances of fungus infection is to use a fungicide when transplanting plants.
• This also helps prevent root rot infection.
• Ensure proper drainage in the soil layer.
• You can increase the soil's drainage capacity by adding some dry mulch made from wood chips.
• Bougainvillea should be pruned before and after the growing season.
• The basal and middle foliage is removed to allow greater air circulation within the shrub branches
• If an infestation is present, one of the following fungicides can be used:
  • A- Wettable sulfur.
  • B- Micronized sulfur.
  • T- Afoghan.
  • W- Bayvidan M 200.
  • C- Buffstein.

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References

Powdery mildew on hazelnuts - green sage
Symptoms of powdery mildew on hazelnut leaves – researchgate