Common diseases of oleander

The oleander has its specifics in the garden. Did you notice anything abnormal about the leaves or flowers of your oleander? He may have contracted a disease. We review for you the most common diseases of oleander, this robust plant but prone to the vagaries of garden life.

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  • The specificities of the
  • oleander Yellow leaves on oleander
    • Solution: surfacing of oleander in pot
  • The problem of snails on oleander
    • Solution: collecting snails!
  • Insects and pests of oleander
    • Solution: a natural insecticide
  • Getting rid of
    • mealybug White mealybug
  • Other diseases of oleander
    • Fumagin Stains
    • on the skin Leaves

The specifics of the oleander

The oleander is known for its drought resistance. Nerium Oleander , by its Latin name, is cultivated very simply. However, oleander can develop pathologies and diseases that can be prevented and treated.

The oleander is found in many hedges and gardens in private individuals, because its leaves and flowers are beautiful and provided, which offers beautiful possibilities of development. If you noticed an abnormal appearance on your oleander, don’t panic. You are told about the most common diseases of oleander as well as their prevention.

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Yellow leaves on oleander

Yellow leaves appeared on your oleander? Not very seyant… but is that a disease? Observe your oleander: if the rest of the oleander shrub looks healthy and only the leaves turn yellow , perhaps this is a sign of a lack. For this, naturally, only certain places will have yellowed. If the whole shrub has yellowed, it may be too late.

Yellow leaves on a oleander may be a sign that your oleander lacks food . If it is in pot, repot it and give it nutrients, good soil.

Solution: surfacing of oleander in pot

So replace the top layer of soil and perform soil and compost surfacing.

This operation is preferably carried out before the oleander growth period, between April and October . Slow-release fertilizer can then do the trick very well: to be placed throughout the growth period of the oleander. These rich fertilizers in potash bring what the laurel needs: your oleander will go back in great shape.

Watch for the exposure of your oleander: sometimes a few yellow or yellowed leaves are the simple sign of a lack of water and dryness of the shrub. Do not leave your oleander in pain for too long, at the risk of losing it. In pot and tray, the oleander likes watering : every two days in the middle of the summer period, depending on the observed heat. In winter, watering is not much appreciated.

The problem of snails on oleander

The oleander is regularly colonized by snails. In small quantities, the oleander offers a real refuge for our shelled friends … But not everyone appreciates their presence. The years in spring and autumn soft and humid, snails can especially proliferate.

Young shoots of the oleander can suffer from this invader: sometimes there is even considerable damage to the bushes. Snails eat with appetite new tender shoots of the oleander, which are absolutely not toxic to him , unlike humans and pets.

Solution: collecting snails!

It may sound pretty intriguing, but why kill snails if you can simply collect them and release them further? Have fun with this, in the morning or in the evening, with the family, with the children. If everyone gets into it, it will do an effective job. Released elsewhere in a place where they will not be harmful to the garden, they will find their happiness.

Insects and parasites of the oleander

From the arrival of spring, aphids (small yellow or green pests clear) multiply and make themselves a joy to colonize the oleander. They settle on young leaves and oleander flowers and do not mander!

With aphids usually comes theappearance of black deposits on the leaves. This deposit is a microscopic fungus called fumagin and prevents the smooth running of the photosynthesis process. This does not promote the natural development of oleander at all, in the middle of the period of growth.

Solution: a natural insecticide

Yes, no need to resort to too toxic or harmful products, the insecticide can be done in a natural way. Make your mix of black soap (3 teaspoons), water (1 liter) and vegetable oil (a few drops) and spray wherever the shrub has signs of aphid colonization.

Se rid of mealybug

Mealybugs are the enemies of the gardener. But no panic, even on the oleander, they can be managed. Since the oleander is a Mediterranean plant , it is prone to the invasion of mealybug, whether it is the black mealybug or the white.

The mealybug is housed on the leaves (lapels) and stems of the oleander. The mealybug is feared of any good gardener because it feeds on the sap of the shrub. On a oleander or on an olive tree, you will have the same problem. Because the sap of the shrub is present in smaller quantities, the shrub is weakened and will not be able to experience normal and regular growth.

The white mealybug

White mealybug is less common than black mealybug but equally annoying. It looks like floury and white clusters that appear in too dry and warm places. So, when wintering your plants and your potted oleander, be careful not to place it in a too dry and warm place.

To treat the problem of mealybug, the same solution used to combat aphids will be effective. Pests and other insects will gradually disappear.

Other diseases of oleander

Other diseases exist and can weaken your oleanders.


You were told about fumagin, this disease very easily recognizable. In pot or open ground, oleander shrubs are also susceptible to this microscopic fungus. This one grows on the honeydew of biting and sap sucking insects (aphids, mealybug) and can hinder the proper development of your oleander.

The solution against fumagin : if you see these Black and fishy deposits, are obviously to be interested in the cause and not to treat the symptom. Therefore, insects responsible for honeydew secretions will have to be eliminated. Damaged and black leaves can then be passed to a soft cloth soaked in aqueous solution with black soap . This operation must definitely be carried out early in the morning or late evening: the sun will not act on the solution and will not burn your plant.

Stains on leaves

The presence of spots on the leaves of your oleander may indicate a disease. The leaf blade is reached, the spots are circular and the foliage ends up being punched here and there. If you notice this, you are probably in the presence of a leaf spot disease , very specific to oleanders.

The manager? A fungus called Phyllosticta. It can extend on a Only restricted area or take the entire sheet. The leaves affected by Phyllosticta end up corner, die and fall.

Phyllosticta grows in humid and cool environments. For example, if you are going through a cool rainy winter or spring and your soil is very poorly drained and airy, you know what to expect.

Solution against Phyllosticta : drain the soil, first of all. Make your floor less compact so that excess water flows freely. Make a contribution of compost, sand and feel free to use Bordeaux porridge as a spray, depending on the weather conditions.

Pay attention to properly pick up diseased leaves from the ground. They promote the spread of the fungus, which does not die at the same time as the leaves of theplant.