Downy Leafspot on Hickory and Walnut
Downy leafspot on hickory (Carya spp.) and walnut (Juglans spp.) is produced by the fungus Pseudomicrostroma juglandis (syn. Microstroma juglandis). The connection to walnut is clearly evident by the fungal pathogen's specific epithet. However, I most often see this disease on hickory growing in deep woods.
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