Plusioporus millipede

The genus Plusioporus belongs to the class Diplopoda, family Chelodesmidae. These millipedes act as soil pests that thrive in moist environments rich in decaying organic matter. While often considered decomposers, they become significant agricultural pests when the organic food supply is insufficient or when the soil conditions favor their rapid population growth in cultivated fields.

These pests primarily target germinating seeds, young seedlings, and underground storage organs such as tubers and roots. Crops like maize, potatoes, and various vegetables are particularly vulnerable. Plusioporus infestations are most common in agricultural systems where plant residues remain in the soil, providing a stable habitat and initial food source for the millipedes.

The biological development of Plusioporus involves stages that require consistent soil moisture. They are generally elusive, living within the soil profile, and emerge to feed on plant tissues. Their life cycle is highly dependent on environmental factors, with population spikes typically occurring during periods of high rainfall or in fields with excessive soil moisture levels.

The damage caused by these organisms is characterized by deep feeding lesions on roots and stems. This mechanical damage not only stunts plant growth but also facilitates the entry of opportunistic pathogens. The secondary infections, such as root rots and fungal wilt, often cause more damage than the millipedes themselves, leading to significant yield loss and irregular crop stands.

Integrated Pest Management (IPM) is essential for controlling Plusioporus. Strategies include:

• Improvement of soil drainage to reduce humidity levels.
• Deep tillage practices to disrupt their life cycle and expose them to natural predators.
• Rotation with crops that are less attractive to millipedes.
• Strategic application of granular soil insecticides during planting to protect sensitive seeds and seedlings.