Further to the discussion concerning control/prevention of downy mildew.
An interesting article appeared in ELM Farm Research Bulletin(No.39, Oct
1998), Berkshire, UK, where research is reported in the context of
controlling downy mildew ( a major pathogen on vegetable crops in the UK).
In trials utilising an inoculated host with the pathogen a number of
treatments were tested including copper oxychloride, garlic extract,
tribasic copper sulphate and sulphur as Top Cop (52% and 8.4%) Stoller
Chemicals Ltd at 1g 100ml.
Application of Top Cop applied pre-innoculation gave increasing levels of
control of downy mildew. Applying Top Cop at inoculation reduced seedling
infection by 40-50%.. Both copper oxychloride and garlic oil had little
effect on infection.
Although this work centered around vegetables perhaps trials are warranted
with the mildew affecting grapes.
Chris Alenson
Organic Advisory Service
Organic Retailers & Growers Assoc. of Australia
Michelle wrote:
DOWNY MILDEW DISEASE, GRAPES - AUSTRALIA (SOUTH WEST)
*****************************************************
A ProMED-mail post
Disease fears for South West vines
Fears are rising that the South West wine region could be infected
with the potentially devastating downy mildew disease. It follows the
discovery of an outbreak in the Swan Valley. Eleven properties have
now been quarantined in the Swan valley and sampling of suspect
properties continues. Agriculture WA [West Australia] officers are
expected to start inspecting vines in the South West wine [production]
region. The Margaret River Wine Industry Association has written to
its members outlining the dangers of the disease and advising them to
apply preventive fungicide. Simon Robertson, viticulturist says the
disease is easily transported by wind and [by the] movement of soil
and vehicles and would eventually reach the South West region.
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