Mouse louse

The mouse louse (lat. Polyplax serrata) is an obligate ectoparasite primarily found on house mice (Mus musculus). Within the agricultural sector, this pest is considered a critical indicator of rodent infestation in storage facilities. While it does not feed on crops directly, its presence is a major concern for the quality and safety of stored agricultural goods.

Taxonomically, it belongs to the order Phthiraptera and the family Polyplacidae. These insects are highly specialized, spending their entire life cycle on the host's body. Their survival and proliferation depend directly on the density of the rodent population, which is why Polyplax serrata is frequently observed in warehouses with poor sanitary conditions.

The biological development of the mouse louse is rapid and continuous. The female deposits eggs (nits) on the hair of the host, which hatch into nymphs and eventually reach the adult stage. The ambient conditions of a grain warehouse, including stable temperatures, provide an optimal environment for these parasites to thrive as long as their host population remains active.

The economic and health impact of Polyplax serrata is linked to its role as a vector for various pathogens. By living on rodents that move through grain stockpiles, these lice contribute to the contamination of stored products with excrement and pathogens. This poses significant risks for food safety, necessitating strict management of the pest-host environment.

Integrated pest management strategies to control this parasite include:

• Rigorous deratization to eradicate rodent populations in facilities.
• Sanitation of storage areas to remove hiding spots and food sources for mice.
• Sealing cracks and entry points in warehouses to prevent re-infestation.
• Implementing regular monitoring and disinfection protocols for storage equipment.