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Discussion id : 769
most recent 5 MAY 03 SHOW ALL
 
Initial post 9 APR 03 by Unregistered Guest
there is powdery white stuff at the bottom of each rose and is curling up the leaves what to do?
REPLY
Reply #1 of 1 posted 5 MAY 03 by The Old Rosarian
Your roses have downy mildew and should be sprayed with a fubgicide or the mildew will kill the new growth. Just ask for a rose fungicide and then following the directions on the package. It won't take long to cure this problem.
REPLY
Discussion id : 68
most recent 12 MAR 03 HIDE POSTS
 
Initial post 12 MAR 03 by Unregistered Guest
What is powdery mildew?
REPLY
Reply #1 of 1 posted 12 MAR 03 by Alex Sutton
Powdery mildew is a fungus. It usually manifests itself as a white powdery substance on plant surfaces. Leaves may be distorted or twisted.
Fungus spores are carried on the wind. When the spores make contact with a plant, they will start to germinate if the temperature is between 42 F and 71 F degrees. (Spores cannot survive temperatures of 90 F or more, or water.) Optimum conditions for powdery mildew are cool, damp nights followed by days that are warmer and less humid.
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