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re virus streaks and weather

Tom said <<Apparently many (?most ?all) irises carry virus. The visible
expression of
it depends on the iris's ancestry and the climate and weather.>>

So, what kind of climate and weather makes the virus decloak?  I notice Honey
Glazed has a lot of what I think is viral streaking in the falls this year
(yes, I have an IB in bloom - it's about 8-12 inches tall) - so my guess
would be freezing temperatures in bud, low humidity (for  east tennessee),
and clear hot days.  Is this it?

Linda M lmann76543@aol.com e tenn usa

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