In article , Instep walking@nos
pam.instephols.co.uk writes
Does anyone have a foolproof cure for whitefly? I need to eradicate them
from my greenhouse.
Ann

We use a foliar application of nettle infusion. It always works for us.

Further details at: http://www.nugget.demon.co.uk/MetaFAQ/nettle.html
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Alan & Joan Gould - North Lincs.