they are very persistant when you get 'em. I use diluted liquid ivery soap
which does a good job on the aphid but does not kill the
eggs........so.....constant watch is reqyired to spray again at the first
sign of new ones......get 'em before they can lay eggs and you will beat
'em........a common problem in a greenhouse.......there are other sprays
that will kill plus have a residual effect so only one spray is
needed......if you dont mind using "those" sprays.......HW
My neighbor, who is new to gardening, has aphid in her greenhouse in a
big way.