Aphides
From Allotments4All
Green, brown or black flies, of small size but always in great numbers, infest various crops. Spray with soapy water or with paraffin emulsion, made as follows: Dissolve a handful of soft soap in boiling water. Add a wineglassful of paraffin and two gallons of water. Stir well, spray as required.
Take about 8ozs of Elderberry leaves put into old saucepan with a pint and a half of water bring to the boil and then leave to simmer for 30 minutes. When cool add a teaspoon of washing up liquid, Put liquid into sprayer and apply. First class for killing green/Blackfly and carrot fly
