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Although the robinia tree is very robust, it can still happen that some pests make it. Those who intervene in time, but can prevent worse.
The Robinia, also called Robinia pseudoacacia, is one of the robust trees. Life-threatening illnesses or a life-threatening infestation of pests hardly occur in healthy Robinien.
Often, the owner of the trees, however, create Robinia leafminers, aphids or the Phloespora leaf spot disease. Here's how you can easily get these problems with your Robinia under control again.
Common diseases and pests at a glance:
✢ Robinia miniature moths
As the name implies, the robinia leafminer is a pest that specializes in the leaves of robinia as food. The Minier Moth has only been found in Europe since 1983 and has no natural predators here.
An infestation is easily recognizable by the characteristic damage pattern of a meandering feeding track in the leaves.
The caterpillars can be easily collected on the affected leaves. However, the measure is not really necessary, because despite the visual damage, the health of the Robinie is not permanently impaired by the miner moths.
✢ Phloespora blotch disease
Phloespora blotch disease is a relatively common disease of the robinia caused by the fungus Phloeospora robiniae, which occurs especially after a rainy spring.
The damage is shown in brown spots on the leaves, which reach a diameter between half a centimeter and one centimeter. During the year, the leaves are often deformed and torn at the edges. Phloespora blotch disease can also affect shoots or petioles.
The infestation is not immediately life-threatening, but should be fought. First, try the manual solution to the problem: remove any diseased leaves in the fall and trim the branches where you notice impending shoots. Only when the same symptoms recur next spring is it advisable to use fungicides.
An aphid infestation is also common in Robinia. If you recognize the pests early enough, it is often sufficient to spray the leaves with a hard stream of water. If that does not help, you can try soapy water. Dissolve a tablespoon of curd soap in a liter of lukewarm water and spray the leaves regularly.
Oil-based pesticides, on which the aphids suffocate, have also proven successful in practice. Alternatively, you can also locate beneficial insects such as hoverflies, lacewings or parasitic wasps on the robinia. However, there is always the risk that the beneficial insects seek their food on other plants than on the infested robinia.