have a Sultan plum (2 years old, commercially bought, grafted onto
dwarf root stock) that is suffering from bladder plum. What causes
this and is there a cure other than slash and burn?
plum is a fungus disease similar to peach leaf curl. It over-winters
in leaf and flower buds. When favourable conditions are prevalent,
such as cool wet weather in spring, the fungus multiplies. It is
spread by rain splash. The fruit becomes spongy and hollow.
Remove diseased material
and infected fruit and burn or throw out in the rubbish do
not place in the compost bin as this will spread the disease. Spray
with Copper Oxychloride or Champion Copper when buds start to swell
and then at 14 day intervals.
by Dr Dan Blanchon from Unitec's Diploma in Sustainable Horticulture and Bachelor
of Resource Management.
with permission from NZOOM Home and Garden content,
from the previous
The views expressed here are not necessarily those of the RNZIH