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Walnut

Rotate cropsWhy Is the Harvest Season Important in an IPM Program?

Nuts are mature when packing tissue has turned brown; at this point, kernel quality is highest and any delay in harvest will cause some loss in quality. Harvest the nuts as soon as shaking on a few test trees removes 80% of the nuts and 95% of husks are split and easily removable.

After shaking, remove the crop from the orchard and hull as soon as possible to prevent further infestation of any navel orangeworm eggs. If harvest is delayed or nuts remain on the ground too long, the kernels may be damaged by high temperatures, molds, or navel orangeworms, which readily enter nuts after the husks have split.

After shaking but before sweeping, look through the nuts and identify pest damage from the current season. This sample will tell you which pests are in your orchard, help you assess the current season’s pest management strategy, and allow you to plan for next year’s pest management activities.


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