Ge­or­gia Finemore, via email

Gardening Australia - - MAILBOX -

I found this in­ter­est­ing leaf/pupa on our Co­rym­bia ‘Sum­mer Beauty’ tree. Can you tell me ex­actly what it is?

Mar­tyn Robin­son says

It is a gall formed by a tiny cynipid wasp. Sev­eral in­sects cause galls on plants. The in­sect lays its eggs in the plant tis­sue, and the ir­ri­ta­tion causes the tis­sue to swell around the eggs and hatch­ling lar­vae, which pro­vides them with a safe place to feed and grow. You can cut them off and com­post them – or leave them be, as they do lit­tle dam­age to the plant.

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