Walnut Tree Pests and Diseases


Walnut Tree Pests and Diseases

Crown Gal is caused by the bacterium Agrobacterium tumefaciens and it usually concerns young trees. The most common symptom is tumors (overgrowth) that appear in the roots, just above or below the soil line. Infected trees with many galls will gradually become unable to transfer water and nutrients to the upper parts of the tree. As a result, they slowly become weak and they finally die.  The bacterium can survive for many years in the soil.

Walnut blight is a bacterial disease caused by Xanthomonas juglandis. It is the most common walnut tree disease that affects foliage and nuts. It appears most often in wet and humid spring conditions. Some of the symptoms are that the kernels shrink, wilt, mummify or discolor. Lesions may appear in the tree bark and leaves, while infected new shoots may die. Rainfall favors the rapid spread of disease, as bacteria are transferred through rainwater to new green tissues and infect them.

Armillaria root rot, Phytopthora root rot and Powdery mildew are also common walnut tree diseases.

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Walnut Tree Facts

How to grow a Walnut tree from seed

Starting a Walnut Orchard

Walnut Tree Climate Requirements

Walnut Tree Soil Requirements and Preparation

Walnut Tree Propagation and Pollination

Walnut Tree Planting

Walnut Tree Thinning and Pruning

Walnut Tree Water Requirements

Walnut Tree Fertilizer Requirements

Walnut Tree Harvest and Yields

Walnut Tree Pests and Diseases

Q&As Walnut Trees

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