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Identifying scale insects on ZZ Plant
Small brown or tan bumps along the stems, particularly near the base, sometimes mistaken for part of the stem's natural texture.
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Life cycle
Crawlers emerge from under scale and disperse. Settled scales are immobile under protective shell.
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Damage to ZZ Plant
Scale insects sap-suck along the stems, weakening growth and causing yellowing in heavily infested stems, with honeydew attracting sooty mould.
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How to treat scale insects on ZZ Plant
Scrape off visible scale with a fingernail or soft toothbrush, then wipe with rubbing alcohol. Follow with horticultural oil, repeating every 1–2 weeks.
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Preventing scale insects on ZZ Plant
Inspect stems periodically, especially near the base, and quarantine new plants before placing them nearby.