Many gardeners suggest using washing-up liquid to help control an aphid infestation. The general consensus online suggests using a weak solution of washing up liquid and water, which will kill aphids on contact when sprayed directly on the plant.

Can you spray Greenfly with washing up liquid?

The most commonly used non-chemical remedy is to spray them with soapy water. You can buy insecticidal soaps but many people make up their own using a teaspoon of washing up liquid diluted in 3 litres of water. The aphids are unable to breath under a coating of soap and subsequently suffocate.

Does soapy water kill greenfly?

Answer: Yes, soapy water will kill different species of aphids and general pest control. ... The basic organic garden recipe consists of one or two teaspoons of castile soap in 1 quart of water. Put the mixture in a spray bottle. Apply this mixture by wiping it onto plant leaves, buds, and stems or by spraying.