In article , vsop
writes
However, I would very much appreciate more info on the subject of "nettle
infusion" as a means of controlling white fly on greenhouse
toms.........recipe, rates of application etc. Does it harm the fruit if
sprayed on them? Do you also use it as a root applied fertiliser in the
normal way ?

The urg nettle infusion FAQ is at:
http://www.nugget.demon.co.uk/MetaFAQ/nettle.html
have a look at that, then I'll fill in any further details you need.
Best wishes.
--
Alan & Joan Gould - North Lincs.