What's eating my begonia 'santa cruz sunset'?

Begonia boliviensis 'Santa Cruz Sunset' is a trailing outdoor and container begonia susceptible to aphids on emerging shoots, vine weevils attacking roots and tubers, and slugs grazing lower stems. Its pendant habit makes it less accessible to slugs than ground-planted types. Vine weevil is the primary concern in containers.

Hanging basket or pot plants wilt without obvious cause; grubs found eating roots and base of tuber when repotted Use nematode drench (Steinernema kraussei) in late summer; inspect soil when repotting; choose compost with built-in vine weevil protection for baskets

Colonies on young stem tips and flower buds; honeydew leading to sooty mould on foliage below Blast with water; apply neem oil or insecticidal soap spray; repeat every five to seven days until colonies disperse

Notched lower leaves and chewed stem bases where the plant trails to ground level Keep baskets elevated; use copper-tape on pot rims; apply iron phosphate bait around supporting stands