3ul. 611, U. S. Dept. of Agriculture. 



Plate 



Diseased and Healthy Persian Walnut Twigs and a Nut Affected with 



Walnut Blight. 



A mi 1 77, typical cankers produced on twigs in one month's time by needle punctures from 

 pure culture; C, a control twig punctured with a sterile needle; D, a diseased nut one 

 month after being inoculated from a pure culture by a needle puncture. 



