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What are the pests and diseases that affect Nutmeg Hickory?
What are the pests and diseases that affect Nutmeg Hickory?-February 2024
Feb 13, 2026 10:46 AM

Pests and Diseases Affecting Nutmeg Hickory

Nutmeg Hickory (Carya myristiciformis), also known as Nutmeg Pignut or Swamp Hickory, is a species of hickory tree native to the southeastern United States. Like any other plant, Nutmeg Hickory is susceptible to various pests and diseases that can negatively impact its growth and overall health.

Pests

1. Hickory Bark Beetle (Scolytus quadrispinosus)

The Hickory Bark Beetle is a common pest that attacks Nutmeg Hickory trees. These small beetles bore into the tree’s bark, creating tunnels where they lay their eggs. The larvae feed on the inner bark, disrupting the tree’s nutrient transport system and weakening its overall structure. Infested trees may exhibit symptoms such as yellowing leaves, thinning canopy, and dieback.

2. Hickory Horned Devil Caterpillar (Citheronia regalis)

The Hickory Horned Devil Caterpillar is the larval stage of the Regal Moth. While the caterpillar itself does not cause significant damage to Nutmeg Hickory trees, its feeding habits can defoliate the tree if the population is high. Defoliation can weaken the tree and make it more susceptible to other pests and diseases.

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3. Walnut Caterpillar (Datana integerrima)

The Walnut Caterpillar is another common pest that can affect Nutmeg Hickory trees. These caterpillars feed on the leaves of the tree, causing defoliation if the population is large. Severe defoliation can weaken the tree and impact its overall growth and productivity.

Diseases

1. Hickory Anthracnose (Gnomonia caryae)

Hickory Anthracnose is a fungal disease that affects various hickory species, including Nutmeg Hickory. It primarily affects the leaves, causing irregularly shaped brown lesions with a yellow halo. Severe infections can lead to defoliation and weaken the tree’s overall health. Proper sanitation and fungicide treatments can help manage this disease.

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2. Hickory Dieback (Phomopsis spp.)

Hickory Dieback is a disease caused by various species of the Phomopsis fungus. It typically affects the branches and twigs of Nutmeg Hickory trees, causing dieback and cankers. Infected branches may exhibit wilting, browning, and dieback. Pruning infected branches and improving tree vigor through proper nutrition and watering can help manage this disease.

3. Hickory Witches’ Broom (Taphrina spp.)

Hickory Witches’ Broom is a fungal disease that causes abnormal growth patterns in Nutmeg Hickory trees. Infected trees develop dense clusters of small branches, resembling brooms. This disease can weaken the tree’s structure and reduce its overall productivity. Pruning infected branches and maintaining good tree health can help manage this disease.

It is important for growers and arborists to monitor Nutmeg Hickory trees regularly for signs of pests and diseases. Early detection and appropriate management strategies can help minimize the impact of these issues and ensure the health and vitality of the trees.

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Keywords: hickory, nutmeg, disease, diseases, dieback, caterpillar, branches, health, defoliation

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