Help!!! Tough White fly infection on Hibiscus
I am fighting with white flies on my four Hibiscus almost a year. I tried earthworms and garlic fermented water (all the info. from this forum). I used two bags of the earthworms for the treatment. At begining, it seems effective. And later, it seems not so effective. The white fly not only damage my hibiscus, but also damage my Michelia ALBA, which is very precious tropical plants.
I am really tired on fighting with this bug.
Are there any other effective ways to deal with white fly?
Thank you all!!!