What's eating my tropaeolum majus 'jewel of africa'?

Tropaeolum majus 'Jewel of Africa' is notorious for attracting aphids — particularly the black bean aphid (Aphis fabae) and the peach-potato aphid — in enormous numbers, which is why it is widely used as a sacrificial trap crop. Caterpillars of the large and small white butterfly also feed heavily on the leaves.

Massive dense colonies covering stems, undersides of leaves, and growing tips; severe wilting, honeydew, and sooty mould. Plants grown as trap crops can be intentionally sacrificed. Use as a trap crop to draw aphids away from vegetables; spray with insecticidal soap or squash by hand. If protecting the plant itself, apply neem oil or pyrethrin early.

Pale green or yellow-and-black caterpillars eat large holes in leaves; heavy infestations can strip plants bare. Inspect leaves daily and hand-pick eggs and caterpillars. Apply Bacillus thuringiensis (Bt) spray for heavy infestations. Fine insect mesh stops adults laying eggs.

Seedlings and young plants eaten at ground level; large holes in mature leaves after damp nights. Iron-phosphate pellets around plants; copper tape on pots; hand-pick at night. Protect seedlings under cloches until established.

Tiny round shot-holes across the leaves, especially on young plants and seedlings; adults jump when disturbed. Cover seedlings with fine insect mesh; apply diatomaceous earth. Pyrethrin sprays kill adults on contact.