Walnut Blight Is A Perennial Problem
Joe Grant heads of Research for the California Walnut Industry. He discusses Walnut Blight, one to several black lesions may appear on catkins.
Infected nuts develop black, slightly sunken lesions at the flower end (end blight) when young; more lesions will develop on the sides of the nut as it matures (side blight). Shoots develop black lesions, and leaves show irregular lesions on blade.
