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Bark beetles tunnel into the cambial layer of the tree forming a main/adult gallery (large gallery in the center) and larval galleries (smaller galleries arising from main gallery). Photo courtesy of University of Minnesota Department of Plant Pathology.
Scanning electron microscope image of an elm bark beetle.
Photo courtesy of University of Minnesota Department of Plant Pathology.
Fungal structures (synnemata) of the fungus are produced in the cambial layer under the bark. White mucilaginous spore masses stick to beetles tunneling in the cambial layer. Photo courtesy of University of Minnesota Department of Plant Pathology.
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