Sublethal Pyriproxyfen Exposure Alters Anopheles arabiensis Fitness and Pyrethroid Susceptibility Without...

Area of Science:

• Vector biology
• Entomology
• Insecticide resistance

Background:

• Pyriproxyfen (PPF) is a juvenile hormone analog used in mosquito autodissemination strategies.
• Evaluating sublethal PPF effects on Anopheles arabiensis fitness and insecticide susceptibility is crucial for integrated vector management.

Purpose of the Study:

• To assess the impact of sublethal pyriproxyfen doses on Anopheles arabiensis fecundity, fertility, body size, and pyrethroid susceptibility.
• To determine if these effects are heritable across multiple generations.

Main Methods:

• Larvae of pyrethroid-resistant Anopheles arabiensis were exposed to sublethal PPF concentrations.
• Adult mosquito susceptibility to permethrin and deltamethrin was evaluated using WHO tube bioassays.
• Fecundity, fertility, and body size were measured across three generations.

Main Results:

• Sublethal PPF exposure reduced Anopheles arabiensis susceptibility to permethrin and deltamethrin in the first generation.
• Significant reductions in mosquito fitness (wing length, egg production, hatching rate) were observed in the first generation.
• No significant changes in insecticide susceptibility or fitness were found in subsequent generations.

Conclusions:

• Sublethal pyriproxyfen doses can temporarily increase insecticide resistance in Anopheles arabiensis.
• PPF negatively impacts mosquito fitness traits in the short term but does not induce heritable resistance.
• Pyriproxyfen shows potential as a valuable tool in integrated vector management strategies.