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Onions - white spots on leaves


 
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sirpsycho
Rank attained: Pedunculate oak tree


Joined: 15 Mar 2010
Posts: 341
Location: Stamullen, Co Meath

PostPosted: Mon Jul 11, 2011 8:34 am    Post subject: Onions - white spots on leaves Reply with quote

I noticed a lot of my onions have white spots on their leaves. After googling, it appears I have Botrytis leaf blight.

Can anyone recommend an over-the-counter cure?
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michael brenock
Rank attained: Chlorophyll for blood


Joined: 12 Aug 2008
Posts: 1275
Location: cork

PostPosted: Wed Jul 20, 2011 9:10 pm    Post subject: Reply with quote

more likely you got Cladosporium leaf blight which is always worse in wet weather and overwintered onions are usually the carriers of the disease.There is no real cure for it as it is more weather related and avoid growing overwintered onions. Botrytis dries up in dry weather but Cladosporium does not. Cladosporium also develops a type of black eve from the small white spots coalescing.
michael brenock horticultural advisor iretired)
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