Paul James said to mix 1 cup of milk to 8 cups of water and to spray underside of leaves and tops till point of run off and to saturate the soil also. I did this on my orchids and haven't had any since. We can't smell any odors but it kills the bugs and also works on blackspot and mildew, good for roses also, you might have to spray twice depending on how bad they are. Wait a week between doses. Good luck.