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Spores and gray to black discoloration of branch wilt fungus, <i>Neofusicoccum (=Nattrassia) mangiferae,</i> extending into trunk of walnut tree. — Spores and gray to black discoloration of branch wilt fungus, Neofusicoccum (=Nattrassia) mangiferae, extending into trunk of walnut tree.
Credit: Janine K. Hasey