Agree with Marsha
We have been using pyrethrins for many years... They are non toxic and derived from vegetative material... We use it on all our edibles at first sign of problems,.. and on roses for aphids.
They are contact effective and will need reapplication when the problem reappears or after rain.
Only thing that got our whitefly infestation under control last year.
You should be able to buy it as a concentrate then dilute as per directions
Geoff
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