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Insects 2018, 9(1), 34; https://doi.org/10.3390/insects9010034

Do Aphids Alter Leaf Surface Temperature Patterns During Early Infestation?

Institut de Recherche sur la Biologie de l’Insecte, UMR 7261, CNRS, Université de Tours, 37200 Tours, France
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Received: 30 January 2018 / Revised: 12 March 2018 / Accepted: 13 March 2018 / Published: 14 March 2018
(This article belongs to the Special Issue Insect-Plant Interactions)
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Abstract

Arthropods at the surface of plants live in particular microclimatic conditions that can differ from atmospheric conditions. The temperature of plant leaves can deviate from air temperature, and leaf temperature influences the eco-physiology of small insects. The activity of insects feeding on leaf tissues, may, however, induce changes in leaf surface temperatures, but this effect was only rarely demonstrated. Using thermography analysis of leaf surfaces under controlled environmental conditions, we quantified the impact of presence of apple green aphids on the temperature distribution of apple leaves during early infestation. Aphids induced a slight change in leaf surface temperature patterns after only three days of infestation, mostly due to the effect of aphids on the maximal temperature that can be found at the leaf surface. Aphids may induce stomatal closure, leading to a lower transpiration rate. This effect was local since aphids modified the configuration of the temperature distribution over leaf surfaces. Aphids were positioned at temperatures near the maximal leaf surface temperatures, thus potentially experiencing the thermal changes. The feedback effect of feeding activity by insects on their host plant can be important and should be quantified to better predict the response of phytophagous insects to environmental changes. View Full-Text
Keywords: Aphis pomi; apple; herbivory; leaf temperature; stomatal behavior; thermal heterogeneity; thermography Aphis pomi; apple; herbivory; leaf temperature; stomatal behavior; thermal heterogeneity; thermography
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Cahon, T.; Caillon, R.; Pincebourde, S. Do Aphids Alter Leaf Surface Temperature Patterns During Early Infestation? Insects 2018, 9, 34.

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