Giant African snail

The Giant African snail (Achatina achatina) belongs to the phylum Mollusca, class Gastropoda, order Stylommatophora, and family Achatinidae. This species is recognized as one of the largest terrestrial snails worldwide, with a shell length often exceeding 20 centimeters in its natural tropical habitat.

This pest is highly polyphagous, posing a severe threat to a wide range of agricultural and ornamental crops. It is known to feed on vegetable crops such as tomatoes, cucumbers, and lettuce, as well as various fruit trees, cereal grains, ornamental flowers, and even young saplings in forestry and nurseries.

The biology of the species is defined by high fecundity and hermaphroditism. A single snail can produce between 100 and 500 eggs per clutch. Under optimal temperature and humidity conditions, the developmental cycle from egg to sexual maturity is completed within a few months, allowing populations to explode rapidly in suitable environments.

The damage caused by the snail involves the intense feeding on leaves, stems, and fruits. The pest leaves a distinct mucus trail on plant surfaces, which can facilitate the secondary spread of fungal and bacterial pathogens. In cases of high population density, these snails can cause complete defoliation, leading to significant economic losses for producers.

Effective management strategies combine cultural, physical, and chemical control measures. Key recommendations for managing Achatina achatina include:

• Regular soil cultivation and weed management to eliminate daytime hiding spots.
• Creation of physical barriers, such as lime or wood ash trenches, surrounding cultivated areas.
• Application of targeted molluscicides containing metaldehyde or iron phosphate as an active ingredient.
• Manual removal of snails during evening hours and the use of bait-based traps.