Garlic Can Kill Garlic may complement broiled snails, but the live ones don't particularly like it. Snail deaths were recorded every 24 hours over four days. When the toxicity of garlic was compared with the synthetic molluscidides phorate, formothion and carbaryl, the garlic extract proved more potent than phorate and carbaryl and less potent than formothion.
Garlic extract is one fifth less potent than niclosamide.
Further extraction and purification of the active molluscicide in garlic may reveal that it is more effective than synthetic molluscicides in controlling snails, as well as less harmful to the environment. D.K. Singh and A. Singh. Biological Agriculture and Horticulture.