Hydrangeas diseases

Hydrangeas diseases

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Fungal diseases

Hydrangea diseases can be varied and dependent on numerous factors, such as insects, fungi and environmental considerations. As for the hydrangeas diseases of fungal origin, let's see which ones can be the most common to be found.
- Botrytis: this is a disease due to a polyphagous fungus, which alternates periods of saprophytic life, with others of parasitic life. It looks like a greyish-green powder and is fought with special products, easily available on the market. It develops in conditions of poor ventilation, especially when late frosts are followed by prolonged rains and in the presence of high humidity.
- Oidium: fungus that presents with whitish spots and in advanced stage, constitutes a sort of rather evident spider web. Rather rare, it usually appears in the summer and proliferates in dry conditions. It will be enough, if taken in time, to guarantee the plants with a continuous supply of water for a period of twenty-four hours, otherwise use specific preparations.

Fungal diseases: Hydrandea virus and melillary armillaria

Some hydrangea diseases they are quite virulent and require radical interventions.
- Hydrandea virus: the symptoms are represented by a stunted growth and a weak and opaque appearance of the affected parts. The virus has a latency period and the symptoms are detectable only in dry conditions, in the summer.
The only possible intervention is the destruction of every infected plant.
- Armillaria melica: saprophma fungus that attacks the root or collar and manifests itself with the presence in the subcortical area of ​​white-cream mycelium plaques. Its development is favored by water stagnations and lesions on roots or collar. The first symptom is the rapid deterioration of bushes or their parts until recently in perfect health: some stems appear wilted, dehydrated, as if they had suffered large shortages of water. On plants with initial or not very extensive attacks, surgical cleaning can be carried out, then disinfecting the collar and adjacent areas with copper salts. If the cryptogamic affection is already advanced, it is not possible to restore it, then quickly remove and destroy the plant.

Harmful insects

The insects that can cause damage to hydrangea plants are:
- aphids, cochineal, spider mites
- snails
- nematodes
For all of these there are specific chemical products, but they are also highly harmful to all other insects, the environment and sometimes to the plant itself. Because the treatment, as it often happens, is not worse than the illness, safer products (malathion and pyrethrum derivatives) are recommended, even if they are less persistent: to remedy this, it will be enough to repeat the treatments with a certain frequency.

Hydrangeas diseases: Hydrangea deficiencies

It is important to pay attention to particular signs that may appear on the hydrangea plant, to understand what is the problem that generated them.
Chlorosis: the plant has a sickly, wasted appearance, the leaves fade while the veins remain green. It will be advisable to transplant in a soil that is richer in nutrients or intervene by administering iron chelates or sequestrene, in order to make the necessary substances available as quickly as possible.
It is important to reiterate that hydrangeas are very strong, strong plants, and hardly present these problems when grown outdoors, on the ground or in pots. Diseases and suffering, on the other hand, are much more frequent in hydrangeas grown in greenhouses, in closed and forcing environments.


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