Tropicals & Tender Perennials: No luck propagating, 1 by hcmcdole

hcmcdole wrote:
Keep them warm, in bright light, and keep the air flowing (a small fan?) Short of that, spray, spray, spray. Cut off the worst affected leaves and dispose of.

Some of the sprays suggested by others are Neem oil, sulfur powder or spray, and one suggested by a commercial grower (expensive due to the size of the bottle) is Milstop.

The other thing is try to cope for the next umpteen months the best you can and when it is warm once again, move it outdoors where it should recover in no time. A lot of times the plant is so weakened by the time warm weather returns that it will never make it. I usually opt for this method but it is aggravating and sometimes not worth the bother.

The worst begonias for mildew are rexes and mallet type canes/shrubs. Even semps get the dreaded mildew and it is a leap of faith to try and keep them but I was able to do that with several semps last winter.

It is hard to believe that this pot of semps (Charm and two double blossom ones plus Pink Minx which is another notorious mallet type) were next to death in the winter but after a few weeks outdoors they regained their full health and beauty.