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Re: Downy Mildew on onions and shallots

On Mon 06 Jul, Angus Macdonald wrote:
> Anybody out there know how to control downy mildew on onions and shallots?  For the se
> cond year running I've been afflicted in this way - no doubt due to wet and mild weath
> er.  The shallots, I've lifted.  The onions are not ready.  They've had prophylactic s
> praying with Diathane 945 and post-symptom spraying but to no effect.  The onions have
>  not collapsed yet but they have all the symptoms. 
>  
> Any suggestions gratefully received.
> 
 I have searched my literature. You used the right spray, but it is not
 a cure but a preventative. You can only destroy any afflicted onions
 The other main recommendation is not to grow
onions there again for a very long time, if ever.. I would try to find
a well exposed place and free-draining, extra grit in the soil perhaps,
or grow them on a ridge. It might also help to start them off in
individual pots under cover and plant out at a more mature stage, taking
care to not disturb the roots. Another idea might be to grow the crop in
several small plots so as to reduce the possibility of cross-infection.
The main problem was likely to have been weather conditions so one
 hopes
for better luck next year.
-- 
Allan Day  Hereford HR2 7AU allan@crwys.demon.co.uk
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