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When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
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Infection of an Insect Vector with a Bacterial Plant Pathogen Increases Its Propensity for Dispersal.

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Area of Science:

  • Plant pathology
  • Entomology
  • Disease ecology

Background:

  • Vector-borne pathogen spread depends on host-vector-pathogen interactions.
  • Pathogen manipulation of vector behavior is a key factor in plant pathosystems.
  • Huanglongbing (HLB), caused by Candidatus Liberibacter asiaticus (CLas), threatens global citrus production.

Purpose of the Study:

  • To investigate how CLas infection influences the dispersal, flight capacity, and sexual attraction of its vector, the Asian citrus psyllid (Diaphorina citri).
  • To determine if CLas manipulates vector behavior to enhance its own spread.

Main Methods:

  • Comparative analysis of dispersal behavior in CLas-infected versus uninfected Diaphorina citri reared on infected/uninfected citrus plants.
  • Flight mill assays to measure flight initiation, duration, and distance in CLas-infected and uninfected psyllids.
  • Quantification of CLas titers in psyllids exhibiting different flight patterns and assessment of female psyllid attractiveness to males based on CLas infection levels.

Main Results:

  • CLas infection increased short-distance dispersal in male D. citri.
  • CLas-infected psyllids initiated flight earlier and engaged in more long-distance flights compared to uninfected psyllids.
  • Higher CLas titers were found in psyllids performing long flights, and female attractiveness to males increased with CLas bacterial load.

Conclusions:

  • The phytopathogen CLas appears to manipulate the movement and mate selection behavior of its vector, D. citri.
  • This manipulation is a potential evolved mechanism for promoting pathogen spread.
  • Findings have significant implications for HLB disease spread models and control strategies.