How to Manage Pests

Pests in Gardens and Landscapes


Walnuts are trained to a modified leader: A central leader is allowed to grow to a height of 5 or 6 feet and is then headed to an outward growing limb. Young walnut trees are best pruned for training in the early spring just after the buds start to swell. This ensures that live wood is available for establishment of the tree's framework. As the tree grows, limbs that develop from buds on the ends of very short shoots or from "necked buds" tend to be weak and break out easily. Remove necked buds to favor the development of widely attached branch angles.

Walnut training
Sketch of a modified leader system

Statewide IPM Program, Agriculture and Natural Resources, University of California
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