When reared at high densities, young Helix aspersa show less shell growth, even if waste products are removed. They also feed less, and show increased mortality. It is suggested that these effects are linked to reduced activity. Juveniles show reduced activity in the presence of adults or their mucus. Mucus of adult Cepaea nemoralis also depresses the activity of both adult and young Helix and Cepaea.

The active ingredients incorporated into molluscicidal baits (such as metaldehyde and carbamate compounds) for the control of terrestrial gastropods (including Deroceras reticulatum, Arion hortensis and Tandonia budapestensis); antifeedant properties of these chemicals; use of attractants, feeding stimulants, adjuvants and appropriate pellet size and density in the production of molluscicidal baits; factors that affect the field efficacy of these baits (weather, species and age variation in pest susceptibility, availability of alternative hosts, learning and habituation, bait persistence, and molluscicide resistance); field assessment of efficacy; and adverse effects on nontarget organisms are discussed.

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