Dutch Elm Disease - Symptoms and elm bark beetles

Vascular Wilts

Dutch Elm Disease - Symptoms and elm bark beetles

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Leaf symptoms

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Vascular discoloration

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Root graft between two elm trees.

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European elm bark beetles

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Egg laying gallery of European elm bark beetle. Direction is with the grain.

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Feeding site at twig crotch caused by the European elm bark beetle.

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Native elm bark beetles

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Egg laying galleries of native elm bark beetle. Direction is across the grain.