Found this in Conscious Gardening by Michael J Roads (p261) – might try it on the green vege bugs this summer and report back…
Organic Insect Spray
Some people may find this a bit repugnant because you use the insect you want to repel as the basis for the spray. Despite this, it is very effective, and harmless to other insects. Catch a teaspoon of the species of insect you want to get rid of and liquidise it in a cup of water. Stand this in the sun for one day, strain it through an old stocking and mix it with 4.5 litres (1 gallon) of water. This is now pathogenically potent for the pest insect, and is a powerful repellant on an energetic level. Do not use a mixture of insects.
Have you ever looked at an insect in relation to a teaspoon?