Does anybody else use neem oil?
I have had success using to eradicate greenfly, blackfly, powdery mildew and even helped halt cabbage white caterpillars.
I mix a table spoon of neem oil with a table spoon of washing up liquid, to one gallon of water, then spray it on the plants to give them a good covering.
It is very safe to use, as it is also used by people to treat various skin problems.