Posted: 13/05/2013 at 14:06
I saw a recipe for spraying with a mixture of oil, washing up liquid and water on an American gardening site. The person who used it said it worked!
Light cooking oil- Rapeseed? 5 tsp to a quart of water
Washing-up liquid 2tsp to a quart of water.
I have a bad infestation this Spring so will try this recipe.
The RHS suggest always spay at night when bees are inactive...even though this is a non-chemical solution.