Transfluthrin Spatial Repellent on US Military Materials Reduces Culex tarsalis Incursion in a Desert Environment

Area of Science:

• Environmental science
• Entomology
• Military science

Background:

• Standard pesticides on military materials can lead to mosquito resistance.
• Spatial repellents offer an alternative by deterring mosquitoes, potentially reducing resistance development.

Purpose of the Study:

• To evaluate the efficacy of transfluthrin on US military materials against natural mosquito populations.
• To assess the duration of transfluthrin's effectiveness in a cool-arid desert environment.

Main Methods:

• Transfluthrin was applied to two types of US military material.
• Mosquito populations, specifically *Culex tarsalis*, were monitored in a southern California field setting.
• Incursion rates into protected areas were measured post-treatment.

Main Results:

• Transfluthrin reduced *Culex tarsalis* incursion by up to 100% initially.
• Effectiveness persisted for at least 16 days, with reductions up to 45% observed.
• The compound demonstrated capability in a cool-arid desert field environment.

Conclusions:

• Transfluthrin is a potentially effective spatial repellent for US military materials.
• It can significantly reduce disease vector mosquito populations in field conditions.
• Further study is warranted for its integration into military vector management systems.