Hello Begonia lovers. I have just returned from a 2 wk long trip to find that all my angelwings (mallets and superbas) have become diseased with powdery mildew. It has rained for about 1 1/2 weeks straight. My Lucerna has been this way however for about a month. What should I do. I don't think they missed me 1/2 as much as I missed them. I did give instructions for my husband to water them and I watered them again when I returned.