Phormium mealybug

Time to act:

Jun, Jul, Aug, Mar, Apr, May, Dec, Jan, Feb, Sep, Oct, Nov

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 is not a problem, but in excess the plants will suffer and could even die.


Smudges of white, waxy deposits appear at the base of phormium leaves, deposited by sap-feeding insects. The mealybug can cause loss of vigour in the plant and, in extreme cases, death.

Find it on




Destroy infested plants. Check new plants carefully to make sure they are not infected.


Discover more ideas and inspiration

Related content

Capsid bugs


Codling moth

Currant blister aphids

Related offers


12 for £18, plus free gift

Buy a collection of 12 structural ornamental grasses for just £18, and also receive 50 anemone bulbs, worth £7, free with your order. This offer is only available while stocks last.

Order now


Save £15 on dierama

These delicate flowering plants with grass-like foliage create a striking focal point in the border. Buy a collection of three for £15, or buy three packs for the price of two with the nine-plant collection for just £30.

Order now