Per Jerry Baker and my County Agent, 1 tsp of Baking Soda disolved in a qt of water, Misted on soil surface. Weekly Per My county agent and Jerry Baker, Mince 1 clove of garlic, allow to marinate overnight in 1 qt of water. Strain out the lumps the following day and mist the surface of the pots. Apply weekly Per Readers Digest book of Organic Gardening. Water plants with Copper Fungicide Per older Ortho chemical book, apply a little Captan powder on surface. **I know some on this list that don't like Jerry Baker, But I think I supposed to give credit to a souce when known and use it. Choose your own weapon Byron