| Stage | Navel Orangeworm | Codling Moth |
| Eggs | Opaque white when first laid; pink after approx. 1 day | Flat, disc shaped. Remains opaque white. |
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| Worms | Brown, crescent-shaped marks behind head. May find multiple worms feeding on a single kernel. | No marks behind head. Feed singly on kernels. |
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| Damage | Copius frass and webbing. | Frass at point of entry; little webbing. |
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Sacramento Valley Orchard Source
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