Slug holes

Latin name : Arion hortensis ; Deroceras reticulatum

Circular holes caused by a slug	Circular holes caused by a slug	Irregular and extensive internal cavities	Slug perforations

Diagnostic characters for visual diagnosis Entry hole usually circular often 0.5cm diameter or wider Presence of a trail of slime around the entry hole Internal irregular cavities beneath the entry hole, sometimes extensive Margin of cavities usually brown and demarcated from tuber flesh Cavities contain debris from slug feeding activities		Notes on confirmatory diagnostics Confirmation of species causing damage requires finding slugs associated with the lesion
		Black slug (Arionhortensis)	Grey slug (Derocerasreticulatum)
Key reference: Wareing DR & Bailey SER (1989). Factors affecting slug damage and its control in potato crops. Monograph, BritishCrop Protection Council 41, 113-120
Possible confusing symptoms :

Diagnostic characters for visual diagnosis