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The culprit is Trionymus diminutus, a 4mm sap-feeding mealybug that breeds relentlessly when the weather is warm and isn't killed by winter frosts. It deposits a white, waxy substance at the base of the sheathed phormium leaves. A mild infestation
,greenhouse and house plantssummer, autumn, winterMore common garden pestsAphidsPhormium mealybugThripsWhitefly
with the hose.roses, dahlias, fuchsias, lavender, rosemary and many garden plantsspring, summer, autumnMore common garden pestsCapsid bugsEuonymous scalePhormium mealybugScale insects