walnut anthracnose black spot gnomonia ophiognomonia leptostyla fungal plant pathogen |
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| navigate by keyword : affected agriculture anthracnose background bacteria beautiful biology black blotch branch bright burn close closeup control detail disease environment farming flora foliage forest fresh fungal fungi fungicide garden green leaf leaves natural nature orchard organic outdoor pathogen plant problem season sheet spot spray spring summer treatment tree vegetable virus walnut |
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| Walnut anthracnose or walnut black spot - Gnomonia, Ophiognomonia leptostyla, fungal plant pathogen. |
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