Odor masking to decrease the attraction of Triatoma infestans (Hemiptera: Reduviidae, Triatominae), a Chagas disease...

Area of Science:

• Vector-borne diseases
• Chemical ecology
• Insect behavior

Background:

• Chagas disease, transmitted by kissing bugs, is a significant public health concern in the Americas.
• Current vector control relies on insecticides, facing challenges like resistance and environmental impact.
• There is a need for novel, eco-friendly methods to reduce vector-host contact.

Purpose of the Study:

• To investigate if altering the natural odor proportions of a host can make it unattractive to the kissing bug Triatoma infestans.
• To assess the effect of nonanal, a component of vertebrate odor, on T. infestans behavior.

Main Methods:

• Nymphs of Triatoma infestans were tested in a dual-choice trap-olfactometer.
• Different doses of nonanal were added to an attractive mouse stimulus.
• Bug behavior was observed in response to the altered odor blend.

Main Results:

• Increasing nonanal concentration reduced the bugs' attraction to the mouse in a dose-dependent manner.
• Nonanal alone did not elicit a behavioral response at the tested doses.
• The addition of nonanal appeared to mask the host's attractive odor.

Conclusions:

• Artificial modification of host odor blends, specifically increasing nonanal, can reduce kissing bug attraction.
• This suggests a potential "push" component for a "push-pull" strategy against kissing bugs.
• This environmentally friendly approach could decrease Chagas disease transmission by reducing vector-host contact.