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Extreme scale insect infestation: what would kill these buggers?!

I just noticed my 15 year old tropical hibiscus tree is loaded. It spends summer out on the deck, and winter indoors.


When I see scale on other plants, I wipe them off with a wet paper towel, then spray weekly with Neem oil.



But this poor plant is loaded. Hibiscus seem to get them every year.

Is there an alternative? It would take hours to wipe these things off of every stem.


Long ago I vaguely remember something about spraying with fish emulsion mixed with something.



Thanks for your help.

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