Pond plants

Fighting leaf tans in quinces - 5 tips against fungal diseases


Brown leaf spots and less yield - these are clear signs of leaf tanning. With our tips you get a handle on the fungal disease in the quince tree.

The leaves turn brown

The so-called leaf tan is a fungal disease that mainly occurs in the quince, hawthorn, medlar and hawthorn. Apple and pear trees are also rarely affected. The cause of this fungal disease is usually the fungus Diplocarpon mespili, which infects the leaves in spring. It attaches itself to the leaves and shoots and ensures that the leaves fall off the tree early in summer.

The annoying thing about the whole thing: The pathogen does not die even in winter, but clings to the shoots and the fall leaves. So, in the coming spring, the fungal disease can quickly flare up again. It is therefore extremely important that you effectively protect your quince tree from infestation and that you take the right measures to combat the leaf tan. Our tips reveal how you can do this. But first of all the damage pattern of the leaf tan is explained in more detail.

Damage to leaf tans explained in detail

As the name suggests, the leaves of the quince tree turn brown over time. At first, only small red spots can be seen on the leaves, which is the case shortly after they have been sprouted. As the process progresses, these areas become larger and larger until the leaf finally turns brown. In the middle of these spots you can then see black spores that allow the fungus to spread further.

The spots get bigger and bigger towards the summer and gradually merge. In the end, the affected leaves are completely brown and eventually fall off. Thus, the quince tree gradually becomes bare from below. But not only the leaves offer a target for this fungus, the fruits can also be infected, so that they are no longer edible.

Prevent leaf tanning

➤ Tip 1 - immediately destroy leaves in autumn:

As always, with regard to leaf tanning, it is important to take preventive measures to prevent the disease at an early stage before causing more damage. To prevent this, you should rake up the leaves and dispose of them immediately in autumn.


Do not put the leaves on the compost, because even from here the leaf tan can spread further.

➤ Tip 2 - Thinning the quince tree regularly:

When the tree top is very densely overgrown, the leaf tan has an easy time. In this case, it stays moist longer after the rain, which of course suits the fungus. It is therefore advisable not to let the tree top become so dense at all. In between, you should always thin out them a bit.

The result: the leaves can dry quickly, which means that the fungus no longer has a chance to settle.

➤ Tip 3 - use plant remedies for strengthening:

Well-cared for quince trees (reading tip: plant and care for the quince tree - this is how it's done) are not only much stronger and bear more fruit, they are also much less susceptible to fungal diseases. For example, you can treat your quince tree with horsetail extract or fruit sprays. We can recommend the following products:

➥ NEUDORFF Neudo-Vital fruit spray
➥ NEUDORFF horsetail extract

Fight leaf tans

➤ Tip 4 - remove infected leaves / shoots:

Once you spot spots on the leaves of your quince tree, you should remove these leaves immediately to prevent them from spreading. However, the fungus also sits on the shoots of the tree, which is why you must also cut the infected branches.

Important: In autumn you should also remove the fallen leaves under the tree as soon as possible.

➤ Tip 5 - use organic sprays for fruit trees:

If the infestation has been very strong, you should preventively treat your quince tree with a fungicide in May. For example, you can eradicate the fungal disease with an organic spray for fruit trees or with a copper spray. The spraying should then be done shortly after the flowering period. Another treatment is recommended three weeks later.

➥ NEUDORFF Atempo copper-mushroom-free