Armadillidium speyeri

Systematic position. Armadillidium speyeri belongs to the order Isopoda and the family Armadillidiidae. Although these creatures are crustaceans, they have successfully adapted to terrestrial environments. They are increasingly recognized as significant pests in agricultural settings, particularly where high humidity and organic debris provide optimal living conditions.

Biology and life cycle. These woodlice are nocturnal, spending the daylight hours in cool, damp hiding spots such as under stones, leaf litter, or within soil crevices. Armadillidium speyeri requires high humidity to survive. Their life cycle includes a brood pouch stage, where females protect their developing young, allowing the population to increase rapidly in stable environments like glasshouses.

Nature of damage and harmfulness. Woodlice feed on living plant tissues, showing a preference for soft leaves, stems, and delicate fruits. They leave characteristic irregular holes and ragged edges on the foliage. Beyond direct feeding, their presence often indicates high moisture levels, which can lead to secondary fungal issues. Infestations can result in stunted growth, seedling loss, and reduced quality of harvestable produce.

Susceptible crops. Armadillidium speyeri is a polyphagous pest, meaning it attacks a wide range of plants. It is particularly damaging to vegetable crops in controlled environments, including tomatoes, cucumbers, and peppers. Ornamental greenhouse plants and nursery seedlings are also frequently targeted, often suffering total destruction if not managed in time.

Control measures. Integrated pest management (IPM) is crucial for controlling this pest:

• Improving drainage and greenhouse ventilation to decrease ambient humidity.
• Sanitation, including the removal of weeds, decaying organic matter, and debris piles.
• Physical trapping using damp wood or cardboard mats that can be shaken out and cleaned regularly.
• Application of specialized bait pellets (such as iron phosphate-based treatments) around susceptible plants to curb population numbers.