Common Tree Pests and Diseases in Summer in Middle Georgia

As the vibrant greenery of summer envelops Middle Georgia, trees stand steadfast. However, just as we love the warmth and sunlight, so do various pests and diseases that can threaten the health and longevity of your trees. At Gray Brothers Tree Service, we understand the importance of proactive tree care, especially during the summer months when certain issues can be more prevalent. Let us break down the different types of pests and diseases you might encounter in Middle Georgia this summer, along with tips on identification, prevention, and management.


Aphids are tiny insects that infest trees during summer, particularly on new growth and tender leaves. They feed by sucking sap from the leaves, which can cause wilting, yellowing, and distortion of foliage. Honeydew, a sticky substance excreted by aphids, often attracts sooty mold, further compromising the tree’s health.

Identification: Look for clusters of small, soft-bodied insects on the undersides of leaves. Signs of aphid presence include curled leaves and a sticky coating on the leaves and ground below the tree.

Prevention and Management: Encourage natural predators like ladybugs and lacewings. Prune affected branches and use a strong jet of water to dislodge aphids. In severe cases, insecticidal soap or horticultural oils can be effective.

Powdery Mildew

Powdery mildew is a fungal disease that thrives in warm, humid conditions, making it a common issue during Georgia summers. It appears as a white or gray powdery coating on leaves, shoots, and sometimes flowers of infected trees. Powdery mildew can weaken the tree by reducing its ability to perform photosynthesis and overall vigor.

Identification: Look for powdery white spots or patches on the upper surface of leaves. Leaves may become distorted or yellowed over time.

Prevention and Management: Improve air circulation around the tree by pruning to increase light penetration and reduce humidity. Water the soil rather than the foliage to minimize moisture on leaves. Fungicidal sprays may be necessary for severe infestations.

Oak Leaf Blister

Oak leaf blister is a fungal disease affecting oak trees, especially prevalent during warm, wet weather typical of Middle Georgia summers. It manifests as raised, puckered areas or blisters on the upper surface of leaves. Initially green, these blisters turn brownish-yellow and may drop prematurely, leading to loss of leaves in severe cases.

Identification: Look for blister-like raised areas on oak leaves, usually visible by mid to late summer. The blisters may have a wrinkled or rough texture.

Prevention and Management: Rake and dispose of infected leaves to reduce overwintering fungal spores. Prune surrounding vegetation to improve air circulation and reduce humidity. Fungicidal treatments may be necessary if the disease persists.


Bagworms are caterpillars that construct spindle-shaped bags made of silk and plant debris, which are attached to tree branches. These bags serve as protective shelters as the larvae feed on foliage, often defoliating entire branches if left unchecked. Bagworms are active during the summer months and can cause significant damage to trees if populations are high.

Identification: Look for spindle-shaped bags hanging from tree branches. Inside the bags, you may find small caterpillars feeding on foliage.

Prevention and Management: Handpick bags and destroy them to reduce populations. Prune infested branches and destroy or dispose of them away from the tree. Insecticides may be necessary for severe infestations.


Anthracnose is a fungal disease that affects a variety of deciduous trees in Middle Georgia, including maples, oaks, and sycamores. It thrives in cool, wet weather but can also occur during periods of high humidity in summer. Anthracnose causes dark, irregularly shaped lesions on leaves, which may lead to premature leaf drop and overall tree stress.

Identification: Look for brown or black lesions with irregular margins on leaves. Leaves may curl, distort, or drop prematurely.

Prevention and Management: Improve air circulation by pruning to allow better light penetration and reduce humidity. Rake and dispose of infected leaves to prevent overwintering fungal spores. Fungicidal treatments may be necessary for severe outbreaks.

Gray Brothers Tree Service is Here to Keep Your Trees Thriving

While the beauty of summer in Middle Georgia brings ample sunshine and warmth, it also brings challenges for our trees in the form of pests and diseases. Vigilance and proactive care are key to maintaining the health and vitality of your trees throughout the summer season. At Gray Brothers Tree Service, we’re dedicated to helping you protect your trees with expert care and advice. Whether you’re dealing with aphids, powdery mildew, oak leaf blisters, bagworms, anthracnose, or any other tree-related issue, our team is here to provide professional assistance.

Remember, early detection and proper management practices can make a significant difference in preserving the beauty and longevity of your trees. If you have concerns about pests or diseases affecting your trees this summer, don’t hesitate to contact us. Together, we can make sure your trees thrive and continue to add beauty to your landscape for years to come.

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