Hi Sally,
If you dont mind chemicals you could use provado ultimate bug killer which
is systemic and fruits such as toms can be eaten after a few days. although
id wash them first.
normally i dont use chemicals, just soft soap, but having an infestation of
lily bug, and aphids spreading viruses on sweetpeas last year. I had to
resort to other means.
Hope this is of some help
regards
Cineman
West Mids

"Sally Holmes" wrote in message
o.uk...

I planted some huge planters with a cottage-gardeny mix of tomatoes,
heartease, pot marigolds, nasturtiums and other stuff.

It's filled the planter, the tomatoes have set and everything's fine,
except that the marigolds and nasturtiums have got a mega-infestation of
blackfly. I have little hope of knocking them out using a contact spray as
I couldn't get to every affected stem: is there a systemic I could use
that wouldn't linger on in the tomatoes?

I reckon the tomatoes are at least 2 - 3 weeks off ripening, so it'll have
time to disperse.

--
Sally Holmes
Wakefield, West Yorkshire, England