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Most common diseases in trees

Trees can suffer from pests and diseases, and they are also many and we must pay attention to them so that all specimens can be totally healthy at all times. It is also important to know the ones that appear the most, since this way you can detect them in time and act immediately to save the tree.

95% of the diseases that attack trees are caused by fungi, but they can also be due to various bacteria or viruses. In AgroCorrn we tell you which are the most common tree diseases .

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It is also known as ” hedge disease ” because it most often affects hedges, although it also affects trees such as cedars, cypresses or yews. Its symptoms are that the leaves wither and turn yellow and then brown, which causes the tree to die from rotting both roots and trunk . This disease appears when it is watered excessively or if there is poor drainage, which causes the roots to suffocate. There is no chemical product that is totally effective but it can be tried with sprays on the neck and roots about 4 times a year.

Honey fungus

It is very common both in trees and shrubs, conifers and vines. It is difficult to identify it, since its symptoms are similar to when there is drought, damage by works, oils, fuels or excess of phytosanitary products. The tree begins to wither as if it had no water and ends up drying up, in addition to the trunk and roots rotting . When it appears, you have to disinfect the soil several times , although that does not ensure that you can save it, so you have to ensure that the specimen is always well cared for and drained so that it does not flood.

Powdery mildew

Also known as ” cenizo “, it is a disease produced by various fungi, and some trees are more prone than others to suffer from it. A gray or white dust appears on the leaves, causing the diseased parts to dry out and fall off. It is a fungus that is favored by humid areas and very mild temperatures, especially in spring. It can be treated with contact fungicides that penetrate the leaf.


It is a disease that is caused by various fungi and is characterized by showing small red bumps on the leaves and stems , and can also be orange, yellow or brown depending on its species. The leaves dry and fall off. It appears when there is a lot of humidity, a mild temperature and a lot of rain for a long time, especially in spring and autumn. You must remove the affected leaves and branches so that the others do not become infected, and you can prevent it by spraying every 10 days, especially if this disease has already appeared before.


It is one of the most common fungi in many diseases and also in pests such as aphids, mealybugs or whiteflies , which secrete a substance on which this fungus sits. If any of these pests appear, you have to kill them as soon as possible so that the fungus does not develop. You can detect it as a dry black powder that affects the leaves, especially aesthetically, although it can also affect their vigor.

Maria Anderson

Hello, I am a blogger specialized in environmental, health and scientific dissemination issues in general. The best way to define myself as a blogger is by reading my texts, so I encourage you to do so. Above all, if you are interested in staying up to date and reflecting on these issues, both on a practical and informative level.

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