I'd try various different products making sure you get good contact with the pest. Try an insecticidal soap early in the morning not during mid day with sun on the leaves. Then try horticultural oil (not dormant oil). Finally you might try a pyrethrin/rotenone mix as that is stronger but effective against many pest species. Whatever you use it will be necessary to repeat the application every 2 weeks for a while (3 or 4 applications) as these pests are not generally erradicated with one or two applications.
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