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Ophiognomonia leptostyla

Black walnut

Walnut black spot (Ophiognomonia leptostyla) and how to protect your tree effectively

Radek Štěpán 21. 10. 2022

Are you waiting for a great walnut harvest but looking at your tree made you sad? Well, you probably saw black nuts and drying leaves with black-brown spots. If so, you are dealing with a disease called walnut black spot…