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Pittosporum crassifolium with a heavy infestation of psyllids (Trioza vitreoradiata). These insects are widespread in New Zealand and it is their larval stage that the damage to the foliage occurs. When in their scale-like phase they create small bumps in the foliage that protect them while they feed. Adults are winged, far more mobile and have sucking mouth parts. pests-and-diseases-3512htm'>Plant. Pests and Diseases