White fungi in rose
I live in Santa Ana, Southern California. My roses which are grown in pots and flower bed got some kind of white fungi on the leaves (photo). I am told that this disease may be cause by over watering. At the moment, I water the roses on every 2 days basis, at 6 AM.
How can I cure this fungi disease simply and inexpensively? It is happening to many roses of mine.
One more thing is that how I can make the rose leaves always green and healthy after I get rid of this fungi
Your help is much appreciated.