[Growwine] A curious observation

[Mark Hart]

Yes,

Powdery mildew prefers hot, dry conditions.  It does not need free  
water for a secondary infection cycle.  High humidity at night is  
ideal PM infection weather.  The germinating spores actually wash off  
leaves in free water.  DM is different, it needs a rain to spread.

Mark Hart

On Jun 26, 2008, at 8:24 AM, Paul Bulas wrote:

> Last year, i.e. 2007, was a dry and hot growing season here in  
> southern Ontario. Still, my Niagara had signs of mildew on the  
> leaves by season's end.  This year, by contrast, so far has had more  
> intermittent rain - but the foliage is perfectly clean.  I don't  
> spray for anything.
>
> What gives?  Do some kinds of mildew (downy, powdery) actually  
> prefer dry weather?
>
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