Plusioporus setiger

Systematic position. Plusioporus setiger belongs to the class Diplopoda (millipedes), family Spirostreptidae. As a soil-dwelling organism, it is well-adapted to environments rich in organic matter, often becoming a significant pest in agricultural settings where soil moisture levels are consistently high throughout the growing season.

Affected crops. This pest exhibits a wide host range, feeding on various cultivated plants. Primary targets include vegetable crops, root vegetables like potatoes, and germinating seeds of cereal crops. Seedlings are particularly susceptible during their early development stages when they lack the structural integrity to withstand mechanical damage.

Biology and life cycle. The life cycle of Plusioporus setiger is entirely soil-bound. Females deposit eggs in moist soil crevices. The development process includes several molting stages, with nymphs and adults feeding on decaying vegetation or living plant tissues depending on availability. Their population density fluctuates largely based on soil temperature and humidity profiles.

Character of damage and harmfulness. The economic damage occurs when the pest attacks subterranean plant parts.

• Destruction of germinating seeds and roots.
• Creation of entry points for secondary soil-borne pathogens.
• Stunted growth leading to yield reduction.
• Surface damage to tuberous crops, lowering their market value.

Control measures. Integrated Pest Management (IPM) is essential for controlling this millipede. Cultural practices such as crop rotation and soil tillage can disturb their habitat and reduce population numbers. Chemical control via soil-incorporated granular insecticides or seed treatments is often necessary in high-pressure scenarios. Proper drainage management is also recommended to make the soil less hospitable for these pests.