Re: rose-list digest, Vol 1 #180 - 4 msgs

**"Mary C. Weaver" mcweaver@bellsouth.net>**

Hi to Joanie:

>
>Thanks for the tips on rose care. Never had powdery mildew before. We had an
>unusually wet mid-late summer in Chicago last summer and I'm quite positive
>it was powdery mildew...which doesn't make sense if it's only apparent in dry
>weather.

It isn't impossible to get mildew in wet weather--it's just that wet 
discourages mildew.

Let me quote myself: "Unlike blackspot, powdery mildew is discouraged 
by the presence of water on leaves, and spores are spread by wind, 
not water. . . . This disease thrives throughout North America but is 
especially common in drier climates. Development is optimum when days 
are dry (40 percent to 70 percent relative humidity) and warm (80 
degrees Fahrenheit) and nights are humid and cool (60 degrees 
Fahrenheit). Planting in full sun discourages powdery mildew, as the 
spores are sensitive to direct sunlight."

>
>Nice to see you on the rose-list again. Weren't you working on a gardening
>book
>a year or so ago? Published yet?

Published by Macmillan two years ago. You have a good memory.

:)

See the signature for details.
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Mary C. Weaver
Author, Roses: A Growing Guide for Easy, Colorful Gardens (Macmillan, 1998)
mcweaver@bellsouth.net or maryweaver@mac.com

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