Lesser brown scorpion

Isometrus maculatus, commonly referred to as the lesser brown scorpion, is a member of the order Scorpiones and the family Buthidae. While predominantly predatory, its presence within agricultural ecosystems and greenhouse facilities is considered a nuisance that necessitates monitoring to ensure safe working environments for crop management.

This species is not a direct feeder on crops, yet it frequently inhabits storage facilities, greenhouses, and plantations of tropical produce like bananas and coconuts. It thrives in piles of decaying organic matter, under tree bark, and within agricultural debris, which complicates daily maintenance tasks and pest management efforts.

The biology of I. maculatus is defined by a nocturnal lifestyle and remarkable resilience to varying environmental conditions. Reproduction is sexual, and females exhibit maternal care, carrying their nymphs on their backs, which contributes to the successful colonization of new habitats within agricultural structures.

The economic impact of the lesser brown scorpion is linked to worker safety and potential ecosystem disruption. By hiding in moist, cluttered areas often associated with poor sanitation, they signal suboptimal greenhouse conditions that may also favor the growth of secondary plant pathogens and mold infestations.

Effective control measures focus on habitat modification and sanitation to reduce the shelter available to the species. Recommended management practices include:

• Consistent removal of plant debris, waste wood, and mulch from the greenhouse floor.
• Monitoring and regulating humidity levels to prevent moist microhabitats.
• Ensuring staff use appropriate protective gear when working near soil or organic debris.
• Sealing cracks and using screens to prevent the entry of scorpions into storage areas.