What's eating my narcissus 'thalia'?

Narcissus 'Thalia', a white triandrus daffodil, benefits from the narcissus toxicity that deters most mammals. Its primary enemies are narcissus bulb fly larvae that hollow out individual bulbs, narcissus eelworm causing twisted foliage, and basal rot. Slugs occasionally damage soft emerging shoots in early spring.

Grub tunnels into and consumes the bulb's interior; affected plant either fails to emerge or produces only weak, grassy leaves Drape fine insect-proof fleece or mesh over beds as leaves die back in late spring to exclude egg-laying females; destroy soft bulbs at lifting

Yellowish, distorted, and stunted foliage; soft bulbs with brown internal rings; patches of missing plants over successive years No effective chemical available to gardeners; remove and bin all affected bulbs; rest the soil from alliums and narcissus for 3 years minimum

Holes and slime trails on young emerging leaves, particularly in shaded or damp borders Ferric phosphate pellets; copper tape for pots; hand removal at dusk in wet weather