Walnuts are deciduous trees that are widespread throughout Europe, although they are also found in Asia. They have several uses, both for native wildlife and for humans, as they provide plenty of shade, food since their fruits are edible, and high quality furniture is made with the wood due to its high resistance to insect attacks.
And I want to tell you about them precisely below: those pathogenic insects and microorganisms that at some point can cause problems. But what exactly are walnut diseases and how are they treated?
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What are the diseases of walnut trees?
Being a very hardy plant, it can actually have very few diseases. These show up when the health of the tree is weakened for some reason, either due to excess water in its roots, extreme heat or because it has been pruned with a tool without disinfection, for example. These are the following:
anthracnose
Image – Wikimedia/Jerzy Opioła
Anthracnose or canker is a fungal disease caused by various pathogenic fungi. In the case of walnut, the main cause is the Gnomonia leptostyla. East it causes rounded brown spots on leaves, branches and fruits. You have to be a little vigilant, because these spots start out very small, but over time they get bigger.
Like the vast majority of mushrooms, Gnomonia It is favored by a warm environment with air humidity above 90%. For this reason, it is advisable to apply a fungicide against anthracnose (like this one, which is one sachet for 750 ml of water) in the spring as a preventive measure, and also as soon as symptoms appear.
bacteriosis
Image – Flickr/Hermès Almond
Black walnut plague or bacteriosis, as its name suggests, is caused by pathogenic bacteria. In the particular case of walnut we have to talk about the Arboreal Xanthomonasa type of bacteria that causes leaves to have small oily black spots, with a yellowish center. Sometimes it also affects flowers and fruits.
It is a disease that it can appear especially after the rains, and when temperatures are still mild. Unfortunately, there is no treatment: as soon as the tree shows the first symptoms, the affected parts must be removed.
What pests can you have?
The royal juglans It is a pleasant fruit tree to grow, as it rarely gets sick or is attacked by insects. But we can never forget that it is a living being, and as such it can get sick if conditions weaken it. For this reason, it is also important to be aware of the pests that can affect you:
wood driller
Image – Flickr/Camponotus Vagus
The wood borer, also called borer, is an insect that can cause a lot of problems for hickory trees. The yellow forest (Zeuzera Pyrina) like red (plush plush) whose the larvae burrow into the branches. This causes the leaves to wilt rapidly as they starve for food.
Symptoms appear in late spring and almost always in the upper canopy of trees.. It is important that the walnut tree be treated as soon as possible with an insecticide that eliminates holes, such as this one which is an envelope for 12 liters of water, so that it does not continue to lose leaves.
codling moth
Image – Wikimedia/Olei
Carpocapsa, whose scientific name is Cydia Pomonellais a butterfly which, in its larval phase, destroy fruit by feeding on them. In addition, a hole in them can be easily distinguished.
To avoid losing the harvest, treatments with anti-caterpillar insecticides, such as this one, must be carried out from the first moment in which the fruits begin to develop with specific insecticides.
How is the nut dried?
The first thing to do whenever we find a walnut tree that looks bad is Identify the problem, because if there is a pest or disease, we will have to treat it with an appropriate phytosanitary product. But besides that, it is very important that it is well maintained; that is to say, it must be ensured that it lacks neither water nor nutrients; Now, without going overboard, because if it is watered every day, for example, and the temperatures are mild, it is very likely that the roots will start to die due to excess soil moisture. .
But… there is even more. If we want him to have extra energy to better defeat disease or plague in a shorter amount of time, we recommend treating it with a liquid plant biostimulant, such as East. It is a product that will help your defenses to be a little stronger, so it is more than likely that you will recover without too much problem.
After the symptoms disappear, it will be very good to fertilize the nut with a nutrient-rich fertilizer, such as guano, which can come from bats or seabirds, but which in any case is one of the best and most recommended organic fertilizers for plants to grow healthy. You can buy it here.
Thus, your walnut will become beautiful again, that’s for sure.