sandra: I only use neem oil on all plants. For Phals, I use cotoon wool to apply.
Occasionally I use safer's soap , as per subggestion from this forum.
For the others I just 'fine spray' an emulsion of neem/water. So far it seems to work.
It is soooooo bitter!!!!
[ I will resort to synthetic chemicals only as a last resort. It will not be my first line of defense
]