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Do Aphids Alter Leaf Surface Temperature Patterns During Early Infestation?

Thomas Cahon1, Robin Caillon2, Sylvain Pincebourde3

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Apple green aphids slightly altered apple leaf surface temperatures within three days. This aphid feeding impacts leaf microclimate, affecting insect responses to environmental changes.

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Area of Science:

  • Plant-insect interactions
  • Environmental physiology
  • Arthropod eco-physiology

Background:

  • Arthropods on plant surfaces experience microclimates distinct from ambient air.
  • Leaf surface temperature significantly impacts insect eco-physiology.
  • Insect feeding can alter leaf surface temperatures, but this is rarely quantified.

Purpose of the Study:

  • To quantify the impact of apple green aphids on apple leaf surface temperature distribution.
  • To investigate the localized thermal effects of early aphid infestation on host plants.

Main Methods:

  • Utilized thermography analysis to study leaf surface temperatures.
  • Conducted experiments under controlled environmental conditions.
  • Focused on early infestation stages of apple green aphids on apple leaves.

Main Results:

  • Aphids induced minor changes in leaf surface temperature patterns after three days.
  • The primary effect was on the maximal leaf surface temperature.
  • Aphids influenced temperature distribution locally, suggesting effects on transpiration (e.g., stomatal closure).
  • Aphids were found in areas near maximal leaf temperatures, experiencing thermal shifts.

Conclusions:

  • Early aphid feeding can locally alter leaf surface temperature patterns.
  • This feedback mechanism between insect feeding and plant thermal response is crucial.
  • Quantifying these effects is essential for predicting phytophagous insect responses to environmental shifts.