5 Common Tree Diseases

5 Common Tree Diseases

Tree diseases can be a serious threat to the health of your trees, but they are often not fatal. Many types of diseases that affect trees can be treated easily and will not threaten the tree in any way. Knowing which tree diseases are most common in your area and what to do to prevent them can keep your trees healthy and reduce the risk of loss. Here are some diseases that tree owners are most likely to come into contact with:

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Chronic Disease – this is an infection that affects your trees and will need to be treated as soon as possible. This disease generally infects trees that are in good health. Tree diseases of this nature can spread to other trees or even to people. The fungus responsible for this disease is called fungogenic. Some of the symptoms include brown splotches or patches on your trees. Tree disease treatments will usually involve fungicide and if the infection is severe, a fungicide-based tree treatment may also be required.


Powdery Mildew – this is a fungal disease that attacks needles and branches. Powdery Mildew tends to attack trees at the highest leaf level where it is hot and dry. As soon as you notice any signs of the disease on your trees, isolate them and take immediate action. Do not touch infected leaves and stems with your bare hands.


Leaf Spot – this is a tree disease that causes small yellow spots to appear all over the leaf of the infected tree. The fungus that causes this infection likes warm, wet environments. This means that if your tree stands in the shade during the hot afternoons, this fungus will often grow at its most rapid rate, causing spots of yellow to appear on your trees. To prevent the disease from spreading to other areas of your trees, spray your trees with a fungicide at least once per month.


Powdery Mildew can cause yellow spots on the leaves and stems but may infect bark as well. A quick remedy for Powdery Mildew is to spray it with fungicide directly onto the leaf or stem of infected plants. Allow it to penetrate into the leaf tissue and kill any spores that may be present. Use a normal garden spray or an insecticidal dust.


Leaf blight – this is a disease that affects the tops of trees. It takes the form of a ring of discolored lesions around the leaves that gradually spread to the main foliage and trunk. The disease generally appears on healthy, unblocked stems and leaves. To eliminate this disease, treat your trees with a fungicide at least once per month. This will prevent the disease from spreading to the main foliage and trunk of your tree.


Bacterial infestation – if your tree experiences a severe bacterial infestation, it could lead to yellow spots to appear on the infected leaves and stems. This disease is most often found on trees in wetland areas. An easy way to spot this disease is by noting that lesions do not look like fungal growth. A red rash around the leaf or stem area is present. To prevent this disease you should restrict watering to the affected areas and check moisture levels at the ground level regularly. If the leaves and stems are showing signs of infection, you should contact a tree care professional.


Tree diseases can pose a great threat to the health of your trees, but with a little care, you can avoid them. It’s important that you identify the tree disease that is affecting your tree before you make a treatment plan. This will help ensure that you don’t damage more than necessary. Prevention is always better than cure.