Athoracophorus bitentaculatus

Systematic position: Athoracophorus bitentaculatus belongs to the phylum Mollusca, class Gastropoda, order Stylommatophora, and family Athoracophoridae. This species is native to New Zealand and is easily recognized by the dorsal mantle that covers most of its body, displaying a distinctive network-like pattern.

Crops affected: As a polyphagous pest, this slug poses a threat to a variety of agricultural and horticultural crops. It commonly feeds on leafy vegetables such as lettuce and cabbage, tuberous crops like potatoes, and soft fruits like strawberries. It is also known to damage decorative flowers and greenhouse plants in high-humidity conditions.

Biology and life cycle: The slug is a hermaphrodite with a life cycle heavily dependent on ambient humidity. Eggs are deposited in clusters within damp soil or under decaying organic matter. The developmental rate is influenced by temperature, with multiple generations possible during a single growing season if environmental conditions remain favorable.

Damage and economic impact: Feeding primarily at night, the pest consumes foliage, stems, and fruits, resulting in jagged holes and stunted growth. Beyond physical destruction, the secretion of mucus trails contaminates crops, reducing their market value and promoting the growth of secondary pathogens such as bacteria and fungi on the wounded tissues.

Management strategies: Successful control requires integrated pest management (IPM) techniques. Key actions include maintaining field sanitation by removing crop debris, implementing physical barriers like copper tape or crushed eggshells, and using iron phosphate-based molluscicides. Additionally, encouraging natural predators like ground beetles and thrushes can help maintain lower population densities.