Top‐down control by Harmonia axyridis mitigates the impact of elevated atmospheric CO2 on a plant–aphid interaction. (27th May 2014)

• Record Type: Journal Article
• Authors: Hentley, William T.; Hails, Rosemary S.; Johnson, Scott N.; Hefin Jones, T.; Vanbergen, Adam J.
• Is Part Of: Agricultural and forest entomology. Volume 16:Number 4(2014:Nov.)
• Page Start: 350
• Page End: 358
• Publication Date: 2014-05-27
• Subjects: Insect pests -- Control -- Periodicals; Agricultural pests -- Control -- Periodicals; Forest insects -- Control -- Periodicals; 632.7
• DOI: 10.1111/afe.12065
• Languages: English
• ISSNs: 1461-9555

Abstract

<abstract abstract-type="main" id="afe12065-abs-0001"> <title>Abstract</title> <p id="afe12065-para-0001"> <list id="afe12065-list-0001" list-type="order"> <list-item id="afe12065-li-0001"> <p>The present study investigated the impact of elevated atmospheric CO<sub>2</sub> (390 or 650 µmol/mol) on raspberry genotypes varying in resistance to the large raspberry aphid <italic>Amphorophora idaei</italic> and any subsequent impact on the coccinellid predator <italic>Harmonia axyridis</italic>.</p> </list-item> <list-item id="afe12065-li-0002"> <p>CO<sub>2</sub> enrichment promoted plant growth, ranging from 30% in the partially susceptible cultivar to a more than 100% increase for the susceptible cultivar.</p> </list-item> <list-item id="afe12065-li-0003"> <p>Aphid abundance and colonization (presence–absence) on the susceptible cultivars were not influenced by CO<sub>2</sub> enrichment. On the resistant cultivar, aphid colonization increased from 14% in ambient CO<sub>2</sub> to 70% in elevated CO<sub>2</sub> with a subsequent increase in aphid abundance, implying a breakdown in resistance. Inclusion of the natural enemy on the resistant cultivar, however, suppressed the increase in aphid abundance at elevated CO<sub>2</sub>.</p> </list-item> <list-item id="afe12065-li-0004"> <p>The present study highlights how crop genotypes vary in responses to climate change; some cultivars can become more susceptible to aphid pests under elevated CO<sub>2</sub>. We do, however, demonstrate the potential for top‐down control to mitigate the effect of global climate change on pest populations.</p> </list-item> </list> </p> </abstract>