Notes on Raspberry Diseases
Raspberry leaf spot
Identification
Greenish black spots develop on the upper leaf surface of new leaves.
These progress to whitish grey with a distinct margin and sometimes a
shot hole in the centre. Severely infected leaves drop prematurely.
Period of Activity
The fungus infects only raspberries and overwinters on old leaves and
canes. Young rapidly expanding leaves are infected. Infections occur throughout
the summer especially during periods of wet weather.
Management notes
Keep rows narrow and weeds controlled to improve drying of the plants
in the row. Broad-spectrum fungicides applied to control botrytis grey
mould, generally help to control leaf spot. Some varieties for example,
Reveille, are particularly susceptible.
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