Content
- Common symptoms of oleander: Fungus
- Dry rot (Ascochyta)
- You can do that
- Powdery mildew
- You can do that
- Gray horse (Botrytis)
- You can do that
- Tips
Too much moisture can lead to various fungal diseases
Common symptoms of oleander: Fungus
Oleander is not only beautiful, but also very sensitive to various pathogens. These can be bacterial, but also fungicidal in nature. The diseases listed here are particularly common in oleander.
Dry rot (Ascochyta)
Very often the dry rot or ascochyta occurs on overwintered and thus weakened oleanders. However, the disease also occurs at the end of the summer. Typically, infested plant parts first turn brown, then dry up and die off.
You can do that
There is no effective fungicide against already erupted dry rot. You can only take preventative action by spraying the oleander with a commercially available agent before it is put into winter quarters. If the disease has already broken out, only a strong pruning helps.
Powdery mildew
The powdery mildew is also referred to as "mildew mildew", as this fungal disease forms especially in warm summers. They recognize an attack primarily on the floury acting, white and wipeable coating. This can affect not only the leaf tops, but also the shoots and flowers. Since the infected plant puts a lot of energy into the fight against the parasitic fungus, both the growth and the formation of the flowers falter. Leaves and flowers turn brown and dry up as the disease progresses.
You can do that
Luckily, powdery mildew can be tackled quite easily. For this you can use commercially available fungicides, but spray the infected plant with a mixture of fresh whole milk and water (mixed 1:10). Already diseased parts must, however, be cut back. However, this tried-and-tested home remedy only works with fresh milk, because with preserved milk, the fungicidal microorganisms have been killed.
Gray horse (Botrytis)
This fungal disease, which is also very common in other plant species, occurs in oleanders, especially in autumn. The reason is above all too high humidity, which is why you should pay attention to dry leaves and shoots when entering the winter quarters. Above all, the flowers are affected, but also leaves and shoots can be affected. Diseased plant parts are covered with a gray-white coating and appear as moldy.
You can do that
Preventively, you should remove the dried flowers of oleander before entering the winter quarters. Also always make sure that the plant is always in a slight draft, so that a regular exchange of air is guaranteed.
Tips
First and foremost, the scissors help against all fungal diseases: Cut affected plant parts far back into healthy wood. However, you should wear gloves because the oleander is poisonous.