326 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. 



on leaves, yellowish brown in color on the upper surface, and grayish 

 brown on the under side. Hemispherical masses appear, the acervuli, as 

 little pulverulent brownish bodies. 



On the young shoots the color of the diseased portions is far different. 

 Spots are irregular, shrunken, with edges more highly colored and 



FIG. 78. Bacteriosis on green shoots of English walnut. 



thicker, bearing the pulverulent cushions of the fungus. The appear- 

 ance of the disease on the shoots is a canker, reminding me of the true 

 anthracnose of the grapevine. 



Upon the fruits the parenchyma of the epicarp is invaded in its entire 

 thickness by the parasite. The cankers on the fruit are browner than on 



