CHAPTER VI 
CRANBERRY DISEASES 
THE centers for the production of cranberries in the United 
States are New Jersey, Massachusetts and Wisconsin. So far 
as information is available, it appears that diseases of the 
cranberry are coincident with cranberry-culture. The bog is 
necessarily moist, which condition is’ highly favorable to the 
growth of parasitic fungi. The more important diseases are 
scald, gall and hypertrophy. 
ScaLD 
Caused by Guignardia Vaccinii Shear 
The late varieties of eranberries suffer from a disease known 
as rot or scald. The term scald has been in general use for 
a long time, and it owes its origin to a belief of the growers 
that the softening of diseased fruit was actually a scalding 
caused by heat from the sun when the berries were wet. The 
name scald as used by many growers embraces at least three 
diseases of the fruit: scald, rot and anthracnose. The dis- 
cussion here concerns only the true scald. 
Growers have known this troublesome disease for several 
years. It was the subject of discussions at the early meetings 
of the New Jersey Cranberry Growers’ Association which was 
organized in 1869 (now known as the American Cranberry 
Growers’ Association). Scald is more prevalent in the East 
and Southeast than in the Middle West, although it is well 
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