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As I said in my previous post, probably the only period of the year when one can effectively reduce the population of black scale is early spring, when there aren't any adult alive and all the population consists of the young, them you should treat when the crawlers are visible.
(I'm presuming you are in a part of Australia where there is a period of the year you can call winter, when the plant and insect growth stops.)
Cheers
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Joćo Correia
Cascais - Portugal
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