312 MANUAL OF FRUIT DISEASES 
York. The distribution in America would appear rather 
limited. It occurs widely in Algeria on apricots, peaches and 
cherries; in France on almonds; in Australia and New Zealand 
on plums and other stone-fruits; and in Europe commonly on 
cherries. 
This blight disease constitutes a well-known and important 
factor in peach growing throughout California. Most damage, 
however, is wrought in the more humid localities, where no 
variety seems to be immune. ‘Trees are more or less weakened, 
depending on the severity of the attack, and frequently crops 
are destroyed. Buds are killed, green fruiting twigs are spotted, 
and leaves are dwarfed. Premature defoliation is not at all 
uncommon. 
Symptoms. 
The effects of the Coryneum-blight are shown early in the 
spring. This is particularly true under California conditions. 
The most evident symptoms of blight consist in a gumming 
and death of the buds on the fruiting wood, accompanied by a 
splitting of the bark on branches of the current year’s growth. 
Affected buds may die before spring and thus fail to start, or 
they may start and die later after the young fruit sets. Blighted 
twigs become spotted, and an exudation of gum ensues; finally 
death occurs. The spots may show as early as the first of 
February, at least in California. These are depressed areas 
in the bark, and are in reality cankers. The leaves may be 
affected when young. The lesions produced are circular, 
brownish spots, with dark-red margins; finally the affected 
tissue falls away, leaving a hole in the leaf where each dead 
spot first occurred. Where several such holes occur there 
results a shot-hole appearance. This shot-holing is more 
common as a result of the first lesions produced; lesions de- 
veloped later in the season do not exhibit this peculiarity. On 
the latter spots small grayish tufts of the pathogene may be 
seen. Lesions produced on peach-fruits resemble somewhat 
