Abstract: An effective, readily ingested molluscicidal bait poison includes an inert mollusc bait and two active ingredient precursors. These precursors are edible and non-toxic to terrestrial molluscs when consumed alone. However, the composition which includes the two precursors is fatally toxic to terrestrial molluscs. One precursor is a simple iron compound, while the other precursor is selected from edetic acid, its hydroxyethyl derivatives and salts of these acids. In another embodiment a single active ingredient may replace the two precursors. This active ingredient may include ferric edetate and the ferric hydroxyethyl derivative of edetic acid.

Abstract: A composition is provided which serves as an antifeedant, preventing terrestrial molluscs from feeding upon living plants. The active ingredient, which may be present at concentrations of above 0.05% by weight, is a saponin-containing plant extract. At concentrations above about 0.15% by weight, the composition acts as a terrestrial molluscicide. Exemplary sources of the active ingredient include Yucca schidigera and Hedera helix. The composition may be a liquid or a dry powder, and various formulation enhancing agents may be added to the composition.