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Western flower thrips (WFT) show distinct color preferences based on their laboratory origin, not experimental conditions. Rearing on chrysanthemum also influenced WFT color attraction, impacting pest management trap optimization.

Keywords:
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Area of Science:

  • Entomology
  • Pest Management
  • Insect Behavior

Background:

  • Conflicting research on western flower thrips (WFT) color attraction hinders effective pest management trap optimization.
  • Previous studies showed differing WFT color preferences, possibly due to varied experimental conditions.

Purpose of the Study:

  • To investigate if differing experimental conditions contribute to discrepancies in WFT color attraction research.
  • To test the behavioral response of two distinct WFT laboratory populations to color cues under identical conditions.

Main Methods:

  • Wind tunnel bioassays were used to assess the landing response of German (DE) and Dutch (NL) WFT populations to yellow and blue LED lights.
  • WFT populations were reared on different host plants (bean, chrysanthemum) to evaluate host plant influence on color preference.
  • Behavioral responses were analyzed under controlled, identical experimental conditions for both populations.

Main Results:

  • Laboratory origin significantly influenced WFT color preference, irrespective of host plant rearing (NL WFT preferred yellow; DE WFT preferred blue).
  • A significant host plant effect was observed, with increased attraction to yellow after rearing on chrysanthemum for 12-14 weeks.
  • Initial single-choice tests supported prior findings, showing NL WFT preference for yellow and a trend for DE WFT preference for blue.

Conclusions:

  • Differing WFT color responses are primarily linked to their laboratory of origin, not experimental setup variations.
  • Long-term isolation from wild populations may contribute to these distinct color preferences.
  • Understanding WFT population-specific color attraction is crucial for optimizing trap designs in pest management.