How these pests survive beats me,
I have tried hover fly larvae, great if used in confined spaces.
I have tried fatty sprays, not much success, have tried systemic but if the plants are not growing strongly then little absorption, according to customer services of the product concerned.
Now trying a new ,to me, but highly recommended by commercial growers, product for indoor and out.
The only problem with most contact sprays is that each leaf must be sprayed and especially underneath, which is not so easy to do when the plant has lots of growth. second picture as an example.
The plants shown were taken out of the greenhouses to enjoy some welcome rain fresh air, and milder temperatures. Sadly no sun.