"sarah" wrote in message
...
Nick Maclaren wrote:

In article ,
sarah wrote:

I don't find Derris very effective.

That last is helpful, as it's all our local shop sells. Do you have a
local supplier of Savona, or do you buy online?

Effectively online (e.g. by telephone). Green Gardener (though they
are not allowed to list it in their catalogue, for bureaucratic and
monopolistic reasons) or Tuckers (Devon). Either will post a litre,
which lasts for ages.

Thanks for that -- I'll try it.

I have in the past used a mix that is made of boiled up rhubarb leaves which
have been strained through a pair of tights. I then add a couple of drops
of washing up liquid to aid the wetting capacity. I believe there are legal
issues with this as it constitutes manufacturing pesticide on domestic
premises!!!!