Milk snail

The milk snail (Otala vermiculata) is a terrestrial pulmonate gastropod mollusk belonging to the Helicidae family. Originally native to the Mediterranean region, this species has become a significant agricultural pest in various parts of the world, known for its rapid reproduction and ability to adapt to diverse climatic conditions.

As a polyphagous pest, the milk snail feeds on a wide range of plants. Its diet includes various vegetable crops like lettuce, cabbage, and tomatoes, as well as fruits, vineyard foliage, and ornamental plants. When infestations are severe, they can devastate seedlings and significantly reduce the yields of commercial crops by consuming large quantities of leaf tissue.

The biology of the milk snail is highly moisture-dependent. These mollusks are primarily nocturnal and remain inactive during the day in cool, damp hiding spots. Reproduction occurs after mating, with eggs deposited in the soil. The life cycle allows for rapid population growth when environmental conditions, particularly humidity, remain consistent, making them difficult to eradicate once established.

The damage caused by Otala vermiculata is characterized by ragged holes in leaves and the complete destruction of young sprouts. The snail uses its radula to scrape plant tissues, often leaving only the main veins. Furthermore, the presence of their slime trails and excrement contaminates the crops, rendering them unsellable and reducing the overall quality and aesthetic value of the harvest.

Effective management strategies require an integrated approach. Cultural controls involve removing debris, weeds, and other potential shelters near crops to discourage snail presence. Mechanical barriers, such as copper tape or gravel, can provide temporary relief. For more severe cases, the application of targeted molluscicides containing iron phosphate or metaldehyde is often necessary to suppress the population.