What's eating my zantedeschia 'edge of night'?

Zantedeschia 'Edge of Night', a dark-leaved calla lily grown outdoors or in containers, is most commonly damaged by aphids clustering on new growth and slugs attacking emerging foliage. Thrips scar the spathes. Spider mites can be an issue under glass or in dry spells. The rhizome is also susceptible to vine weevil in containers.

Dense colonies on leaf undersides, stems, and inside spathes; distorted growth, honeydew, and sooty mould Spray with insecticidal soap or neem oil; encourage ladybirds and lacewings; use a systemic insecticide for severe outbreaks

Silver-bronze streak marks and stippling on spathes and leaf surfaces; petals may appear distorted or prematurely browned Apply insecticidal soap or spinosad spray; remove affected spathes; use sticky blue traps to monitor populations; introduce Amblyseius cucumeris under glass

Holes in emerging leaves and damage to low-lying spathes; silvery slime trails at soil level Apply iron phosphate pellets around plants; hand-pick at night; keep surrounding area free of damp debris where slugs shelter

Larvae tunnel into rhizomes, causing wilting and plant collapse, especially in containers Apply Steinernema kraussei nematodes in late summer; treat pots with imidacloprid drench; inspect rhizomes at repotting time and destroy any white grubs