Cercospora Leaf Spot On Crepe Myrtle: Symptoms, Prevention, And Treatment In 2023

February 26, 2023 Post a Comment

Leaf fungus isn't pretty, but it won't kill your crape myrtles and from www.nola.com

Crepe myrtles are a popular landscape plant known for their vibrant summer blooms and attractive bark. However, like any plant, crepe myrtles are susceptible to diseases, and one of the most common is cercospora leaf spot. In this article, we will discuss the symptoms, prevention, and treatment of cercospora leaf spot on crepe myrtles in 2023.

Symptoms of Cercospora Leaf Spot

Cercospora leaf spot is caused by the fungus Cercospora lythracearum, which affects the leaves of crepe myrtles. The first symptoms of the disease are small, circular, reddish-brown spots on the leaves. As the disease progresses, the spots will grow larger and merge together, causing the leaves to turn yellow and drop prematurely.

In severe cases, cercospora leaf spot can cause defoliation, weaken the tree, and make it more susceptible to other diseases and pests.

Prevention of Cercospora Leaf Spot

The best way to prevent cercospora leaf spot is to maintain good cultural practices. This includes:

Planting crepe myrtles in well-drained soil and avoiding overwatering
Pruning the tree to improve air circulation
Removing fallen leaves and debris from around the base of the tree
Fertilizing the tree with a balanced fertilizer in the spring

It is also important to choose crepe myrtle cultivars that are resistant to cercospora leaf spot, such as 'Natchez' or 'Tuscarora'.

Treatment of Cercospora Leaf Spot

If your crepe myrtle is already infected with cercospora leaf spot, there are several treatment options available:

Fungicides: Apply a fungicide containing chlorothalonil or mancozeb according to the label instructions. Repeat the application every 10-14 days until the disease is under control.
Pruning: Remove infected leaves and branches and dispose of them properly to prevent the spread of the disease.
Watering: Water the tree deeply and infrequently to avoid creating a humid environment that favors fungal growth.

It is important to note that fungicides are most effective when used preventatively or in the early stages of the disease. Once the disease has progressed, it can be more difficult to control.

Conclusion

In conclusion, cercospora leaf spot is a common disease that affects crepe myrtles. By following good cultural practices and choosing resistant cultivars, you can prevent the disease from taking hold. If your crepe myrtle is already infected, treatment options include fungicides, pruning, and proper watering. Remember to always read and follow the label instructions when using fungicides, and to use them responsibly to avoid harming beneficial insects and the environment.

Keep your crepe myrtles healthy and beautiful by staying vigilant for cercospora leaf spot and taking action to prevent and treat the disease.