In article nDgvc.9$yu2.3@newsfe3-gui, Sally
writes
Despite my using companion planting, my greenhouse tomatoes are becoming
infested with whitefly. Any recommendations of biological control would be
gratefully received.

Using copious numbers of tagettes kept whitefly at bay in our
greenhouse.

--
Jane Ransom in Lancaster.
I won't respond to private emails that are on topic for urg
but if you need to email me for any other reason, put ransoms
at jandg dot demon dot co dot uk where you see