it overwinters in fallen leaves, husks of nut pods and fruits themselves under tree.

green rotten closeup autumn agriculture vegetable anthracnose pathology foliage leaves burn grow pests growing fresh diseased virus fungal branch pathogen detail spots brown leaf holding hand prevention gardening protection sick nut fungus immune system freckle freckles tree close walnut cut fungi garden bacteria orchard farming sheet fungicide biology environment marssonina juglandis gnomonia leptostyla