330 



UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. 



leaves ordinarily does very little injury and the disease would be of 

 little economic importance di'd it not attack the nuts. Many of these 

 may become diseased and fall when they are one eighth to one half an 



, FIG. 80. Bacteriosis on leaves. 



inch in diameter, and continue to drop more or less all through the 

 summer. Pierce estimated a loss of from 50 to 80 per cent in badly 

 diseased groves. We have never made a careful estimate of the loss 



