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Identifying scale insects on Echeveria
Small brown or tan shell-like bumps on the underside of leaves, often near the base of the rosette where they're easy to miss.
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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 Echeveria
Scale insects sap-suck along the leaf surface, causing discoloured patches and weakening affected leaves, with honeydew that can attract sooty mould.
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How to treat scale insects on Echeveria
Scrape off visible scale with a fingernail or soft toothbrush, then wipe gently with rubbing alcohol, being careful not to disturb the waxy farina coating too much.
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Preventing scale insects on Echeveria
Inspect leaf undersides and the base of the rosette periodically, and quarantine new plants before placing them nearby.