I think the ones I were given were heavily infested. The ... blighters were hardcore meths addicts by the end. It was a shame about my beautiful old, fuchsia phal, though.
I have always used surgical spirit applied with a cotton bud - arduous but ultimately rewarding, resulting in infestation being eradicated and a healthy plant. For severe infestation, it may be worth considering a systemic insecticide, although it wouldn't be my first choice tbh.
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For severe infestation, it may be worth considering a systemic insecticide, although it wouldn't be my first choice tbh.