Using environmental factors to predict Rhipicephalus sanguineus s.l. (Acari: Ixodidae) mortality.

Area of Science:

• Veterinary Entomology
• Environmental Science
• Pest Management Science

Background:

• The brown dog tick (Rhipicephalus sanguineus s.l.) can establish indoor populations, posing risks of pathogen transmission to humans and pets.
• Tick survival is influenced by abiotic factors like temperature and relative humidity (RH), but quantified relationships with mortality are lacking.

Purpose of the Study:

• To quantify the relationship between environmental factors (temperature and RH) and Rhipicephalus sanguineus s.l. mortality across all life stages.
• To evaluate mortality patterns in three different Rhipicephalus sanguineus s.l. strains under various environmental conditions.

Main Methods:

• Assessed mortality of three Rhipicephalus sanguineus s.l. strains across 20 combinations of five temperatures and four RH levels.
• Analyzed data to establish predictive relationships between environmental factors and tick mortality probabilities.

Main Results:

• Mortality probabilities varied among tick strains but were generally higher with increased temperature and decreased RH.
• Larval survival was limited to one week at or below 50% RH.
• Tick mortality was more sensitive to temperature fluctuations than to RH changes.

Conclusions:

• Established predictive relationships between environmental factors and Rhipicephalus sanguineus s.l. survival.
• Findings enable estimations of tick survival in diverse residential settings and inform pest control strategies.
• Provides crucial data for parameterizing tick population models and developing efficient management tactics.