What's eating my mustard spinach 'savanna'?

Mustard Spinach 'Savanna' (a komatsuna type) is a brassica and attracts the full set of crucifer pests: cabbage white caterpillars are the worst offender, followed by flea beetles, aphids, and slugs. Row covers from sowing prevent the majority of damage, and Bt handles caterpillar outbreaks.

Voracious larvae chew large holes through the tender leaves; heavy infestations shred plants within days; green frass is the tell-tale sign. Row covers from sowing; Bt kurstaki spray at first sign; hand-pick caterpillars and destroy egg clusters on leaf undersides.

Countless tiny round shot-holes, most severe at seedling stage; plants stressed by drought are hit hardest. Row covers; water regularly to reduce stress; kaolin clay spray as a physical barrier; spinosad for heavy attacks.

Dense grey-green colonies on undersides of leaves; waxy coating; leaves curl; honeydew promotes sooty mould. Strong water jet; insecticidal soap or neem oil; avoid high-nitrogen feeding that promotes soft new growth attractive to aphids.

Irregular holes and slime trails on young transplants and seedlings, mainly overnight; worst in wet weather. Iron phosphate pellets; beer traps; copper barriers; thin surface mulch to reduce slug shelter.