It is evident that Cercospora circumscissa , Sacc., has developed to a 
very injurious extent in California, especially in the coast region. The 
coast counties will always be apt to suffer most from its action because 
of the frequent fogs and the greater general humidity of the atmos¬ 
phere. Almond leaves from St. Helena, Suisun, and Acampo, Cal., 
fail to reveal the presence of G. circumscissa. Some u shot hole” 
fungus, however, is injurious at Suisun. 
SOME OF THE STOCKS AFFECTED. 
According to Mr. J. B. Ellis, C. circumscissa has been found on the 
peach in Florida by Mr. Calkins. The form affecting the almond and 
that on the peach, as found in California, are doubtfully distinct. Peach 
trees grown in close proximity to affected almond stocks may produce 
fruit considerably marked by this fungus. On one peach many conidi a 
were found. There is evidence that this form does not readily mature 
spores on the peach, although many points of infection may be present. 
Thirty-six such points were seen on one stunted peach an inch in di¬ 
ameter. The fungus produces on the fruit a black, circular, depressed 
spot, which injures its appearance, although the decay does not extend 
inward more than one-eightli of an inch. All parts may be affected 
and the spots somewhat resemble those produced on the same fruit by 
Cladosporium. The leaves of peach frees are likewise considerably af¬ 
fected by ■Cercospora. The trees affected are only those situated so 
near diseased almonds that infection may occur by spores falling or 
blowing from them. On a portion of one peach tree thus situated the 
leaves near the almond were nearly destroyed. (Plate xi, Fig. 1.) 
Peach trees in other portions of the orchard, even those growing within 
40 feet of the affected almonds, were virtually free from the disease. 
Leaves from peach grafts on almond stocks growing at Arch Beach 
showed the characteristic spots, although the conidia of Cercospora 
could not be found on the material received. These facts indicate that 
some immediate source of infection extraneous to the peach tree itself 
must be present before the tree will suffer from the disease. This is 
explained by the habits of the fungus on peach leaves. While these 
leaves obtained near affected almond stocks are often thickly infested, 
a single leaf sometimes showing forty or fifty characteristic points of 
infection, there are rarely more than two or three of these which bear 
conidia. They are mostly sterile on both surfaces of the leaf. The 
parasite penetrates and lives within the peach leaf, producing its usual 
effects, yet apparently fails to find the proper food supply or other con¬ 
ditions required for reproduction. The fact that the peach tree is usually 
infected from the almond is opposed to the view that the Cercospora 
found on the former is distinct from that occurring on the latter in Cali¬ 
fornia. Peach twigs are in rare instances infested by this fungus. 
