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in Problem solving
RHS advice on whitefly:
Spraying with water containing a few drops of washing up liquid will help keep most aphids under control although you will need do it regularly. Lupin aphid is a distinct species and can be very stubborn, so an organic bug spray may be needed to clear those:
I would recommend spraying neem oil on the plants. I searched everywhere for the best way to get rid of these pests and I found that neem oil worked the best. Dont forget to spay the soil though as this is where the eggs are laid. Soapy water would also work fairly well as long as you sprayed the area regularly. However I dont think this will kill the eggs, only the adult flies. Hope this helps.