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Related Experiment Video

Updated: Aug 12, 2025

Application of Two-spotted Spider Mite Tetranychus urticae for Plant-pest Interaction Studies
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Spider mites avoid caterpillar traces to prevent intraguild predation.

Shiori Kinto1, Toshiharu Akino2, Shuichi Yano3

  • 1Laboratory of Ecological Information, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan. kinto.shiori.65s@st.kyoto-u.ac.jp.

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Spider mites avoid plant leaves with caterpillar traces, demonstrating a new defense strategy. These findings suggest natural compounds could repel spider mites from crops.

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Area of Science:

  • Ecology
  • Chemical Ecology
  • Entomology

Background:

  • Spider mites (Tetranychus kanzawai, T. urticae) are small, often incidentally consumed by caterpillars.
  • Intraguild predation avoidance is crucial for mite survival.

Purpose of the Study:

  • To investigate if spider mites avoid food plant leaves contaminated with caterpillar traces.
  • To identify the role of chemical cues in this avoidance behavior.

Main Methods:

  • Experimental setup: Adult female mites were presented with leaves bearing traces of various caterpillar species.
  • Behavioral assays: Mite settling behavior was observed on contaminated leaves and filter paper.
  • Chemical analysis: Acetone extracts of caterpillar traces were used to test mite response.

Main Results:

  • Both mite species avoided settling on leaves with traces of all tested caterpillar species.
  • Avoidance behavior persisted for over 48 hours and occurred on plant stems.
  • Mites avoided acetone extracts of caterpillar traces, confirming chemical cues are responsible.

Conclusions:

  • This study demonstrates, for the first time, a repellent effect of herbivore trace chemicals on heterospecific herbivores.
  • Natural compounds mimicking caterpillar traces may offer a novel strategy for managing spider mite infestations in agriculture.