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writes

I seem to be developing a problem with white fly on Lillies and other
plants. Can anyone recommend an 'organic' method of controlling this
pest?

We always use nettle infusion for whitefly and it is very effective.
Details for making it can be seen at:
http://www.nugget.demon.co.uk/MetaFAQ/nettle.html
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Alan & Joan Gould - North Lincs.