Mechanisms by which pesticides affect insect immunity

Area of Science:

• * Entomology
• * Toxicology
• * Immunology

Background:

• * Understanding pesticide effects on insect immunity is crucial for pest and disease vector control.
• * Beneficial insects, such as bees, are vulnerable to pesticide exposure due to food gathering behaviors.
• * Sublethal pesticide exposure can compromise insect immune defenses.

Purpose of the Study:

• * To review the current knowledge on how pesticides affect insect immunity.
• * To identify key immune pathways and cellular processes impacted by various pesticide classes.
• * To highlight the implications for insect health, agriculture, and disease vector management.

Main Methods:

• * Comprehensive literature review of studies on pesticide-insect immunity interactions.
• * Analysis of data on effects on hemocytes, phagocytosis, phenoloxidase cascade, and melanization.
• * Examination of impacts on oxidative stress and behavioral changes like grooming.

Main Results:

• * Organophosphates and botanicals affect hemocyte number, differentiation, and phagocytosis.
• * Several insecticides impact the phenoloxidase cascade and melanization.
• * Synthetic insecticides can increase oxidative stress, potentially affecting antimicrobial peptide production.
• * Pesticides can alter grooming behavior, increasing disease susceptibility.

Conclusions:

• * Pesticides demonstrably affect multiple facets of insect immunity.
• * Further research is needed to elucidate impacts of oxidative stress and to gather population-level field data.
• * Findings have implications for integrated pest management and conservation of beneficial insects.