The hydrangea is one of the robust garden plants that is rarely attacked by fungi. That's why you should regularly check the plant with the beautiful flowers. In this way, fungal diseases can be detected and successfully combated at an early stage.

Browning of the leaves can indicate fungal infestation of the hydrangea

Common fungal diseases

The hydrangea is particularly affected by these fungi:

  • Powdery and downy mildew
  • leaf spot disease
  • gray mold

mildew fungi

In certain weather conditions, powdery mildew multiplies by leaps and bounds. Both the powdery mildew and the downy mildew can bother the hydrangea so much that it even dies. Therefore, this plant disease must be combated early and consistently.

powdery mildew

This fungus is a typical fair-weather fungus that spreads particularly well in pleasantly warm and dry weather conditions.

damage picture

A white, flour-like coating appears on the upper side of the leaf, and also on the stems, buds and blossoms of the hydrangea in the event of severe infestation. The infected parts of the plant wither and die.

Wrong mildew

In contrast to powdery mildew, downy mildew is a bad weather fungus and needs a lot of moisture for growth. Especially in rainy and cool summers, it can multiply by leaps and bounds.

damage picture

A whitish-gray lawn of fungi is visible on the underside of the foliage. If the infestation is severe, brown, yellow or violet spots appear on the upper side of the leaf.

combat powdery mildew

  • Cut off infested plant parts and destroy in household waste. Never add to the compost, as the spores will spread throughout the garden when the fertilizer is applied.
  • In the case of powdery mildew, spray with agents containing nitric or silicic acid, and in the case of downy mildew, use garlic or onion broth.
  • In the case of powdery mildew, spraying with milk supports the treatment.

leaf spot disease

Poor nutrient supply and wet weather conditions promote the spread of this fungal disease.

damage picture

You can recognize the fungus by the brown spots with a very dark center. As the disease progresses, these areas thin out and tear open.

combat

  • Remove infested plant parts and dispose of with household waste.
  • Fertilize hydrangea regularly.
  • If the fungal disease cannot be contained by these measures, treat it with a fungicide.

gray mold

If the air humidity in the winter storage is too high or humid weather conditions prevail over a longer period of time, the gray mold has an easy time.

damage picture

On the young shoots, inflorescences and leaves there is a dirty grey, powdery lawn of fungi. The plant parts wither away.

combat

  • Cut off affected plant parts.
  • Always water Hydrangea in the morning so that spray water can dry off quickly.
  • Thin out the hydrangea regularly to ensure good air circulation.

tips and tricks

Spray the hydrangea preventively with a broth made from field horsetail. This effectively prevents many fungal diseases.

Category:

Vegetable garden