Have you noticed yellow leaves on your fruit tree and wondered what causes fruit tree leaves to turn yellow?

They’re one of the typical autumn features you can expect to see in your fruit trees. But changing of the season is not the only cause of fruit tree leaves turning yellow.

Estimated reading time: 7 minutes

Yellow leaves on fruit trees are a common concern for gardeners, but understanding the underlying causes is key to maintaining healthy trees.

While seasonal leaf yellowing in autumn is completely normal as trees enter dormancy, yellow leaves appearing at other times can indicate issues that need attention.

The four main causes of fruit tree leaves turning yellow include natural seasonal changes, water stress from drought or overwatering, nutritional deficiencies (particularly iron, manganese, or zinc), and viral diseases like apple mosaic virus. By identifying which factor is affecting your fruit trees, you can take appropriate action to restore their health and ensure continued fruit production.

This guide will help you diagnose the specific cause of yellow leaves on your fruit trees and provide effective treatment solutions.

Autumn equals yellow leaves

The most common causes for fruit tree leaves to turn yellow, is the changing of the season to Autumn. It’s also not unusual to see fruit tree leaves start to turn yellow even when it still feels quite summery. For example, it often begins to happen on a tree that’s been fully harvested.

In our orchards, we’ve noticed that the typical pattern is that the leaves stay green and keep doing their job while the tree still has fruit on it.

But as soon as we’ve picked the fruit (often within days) the leaves start to go yellow. This is because the tree has started to go into “senescence”, or winter dormancy.

Two rows of apricot trees in the orchard at the end of summer. About half the leaves have turned yellow.
Apricot trees in the orchard at the end of summer

At that time, the tree starts to withdraw all the nutrients from the leaves back into the buds and bark. The first sign of this happening is the leaves changing colour.

This type of yellowing is completely normal, and you see it every year. However, there are lots of other causes for yellow leaves, including various diseases. It can also be due to something as simple as water!

Yellow leaves can be a sign of a lack of water

We’ve seen other causes for yellowing leaves over the years. One that is of more concern is a lack of water. You can see the classic symptoms on this cherry tree.

A cherry tree with yellow leaves due to lack of water after a blocked dripper. The other trees in the row still have green leaves.
Cherry trees showing the symptoms of lack of water

We always feel terrible when we spot a tree like this in the orchard because it’s completely under our control! It should never happen, but of course it often does.

It’s too easy for this to happen when you have an automatic irrigation system. Drippers can easily block up, and unless you’re checking them regularly (which is a good idea), you might not realise you have a problem.

But don’t worry, the tree will start telling you loud and clear. The leaves will turn unseasonally yellow. The dead giveaway is that the leaves on all the other trees nearby are still green.

Is it too late to fix it once the leaves have turned yellow? Depending on how long the tree has been dry, and what part of the season you discover it, the leaves may not recover even if you start giving the tree water.

But that doesn’t necessarily mean the tree will die, and it definitely doesn’t mean that you shouldn’t bother giving it water!

Nutritional definiciences causing yellow leaves on fruit tree

Another common reason for leaves to turn yellow is nutritional deficiencies. We often see it on citrus trees, where it particularly shows up as yellow veins on the leaves.

If you live in a cooler climate like we do, this can be a normal response of citrus trees to cold winter weather. In that case, it often disappears when the weather warms up.

A citrus tree with yellow leaves, especially in the veins, indicating a nutritional deficiency.

But it can also be due to a problem in the soil, and this is not restricted to citrus trees.

A number of nutritional deficiencies can cause yellow leaves as one of their symptoms. Some of these include iron (as you can see below), manganese, and zinc.

Pale green leaves on a peach tree that are turning yellow due to iron deficiency (also called chlorosis).
Iron deficiency (chlorosis) on peach leaves

If your tree is showing these sorts of symptoms, don’t worry too much about exactly what the deficiency might be. Whatever it is, it’s a clear sign that the tree can’t get what it needs from the soil.

The answer? Feed the soil!

Fruit tree diseases that can cause yellow leaves

A fourth potential reason for yellow leaves is a virus disease, such as apple mosaic virus as you can see in this leaf.

An apple leaf showing patches of yellow alongside the normal bright green. The mottled pattern indicates apple mosaic virus.
Apple mosaic virus on leaf

Viral diseases are not good news and unfortunately are not really treatable. The best bet is to look after the tree as well as you can and try to avoid the virus spreading.

A good tip is to avoid planting other trees of the same type nearby. This is one of the best fruit tree virus databases we know of.

So if the leaves on your fruit tree are turning yellow it may be a perfectly normal seasonal response.

But if you think it could be something else, you might need to do a little detective work to diagnose the problem, because your tree might also be trying to tell you something!

Apricot leaves showing beautiful autumn colours of yellow and orange.
Apricot leaves showing beautiful autumn yellow and orange colours

More helpful resources

Free leaf problem guide

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