walnut anthracnose black spot gnomonia ophiognomonia leptostyla fungal plant pathogen |
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| navigate by keyword : affected agriculture anthracnose bacteria biology black blotch branch close control detail disease environment farming food fruit fungal fungi fungicide fungus garden gardening growth immune system leaf macro natural nature nut orchard organic pathogen pathology phytopathology plant prevention problem protection season sheet sick spot spray summer treatment tree vegetable virus walnut |
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| Walnut anthracnose or walnut black spot - Gnomonia (Ophiognomonia) leptostyla, fungal plant disease |
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