Impact of the leaf miner Cameraria ohridella (Lepidoptera: Gracillariidae) and bleeding canker disease on horse‐chestnut: direct effects and interaction. (20th June 2013)

• Record Type: Journal Article
• Authors: Straw, Nigel A.; Williams, David T.
• Is Part Of: Agricultural and forest entomology. Volume 15:Number 3(2013:Aug.)
• Page Start: 321
• Page End: 333
• Publication Date: 2013-06-20
• Subjects: Insect pests -- Control -- Periodicals; Agricultural pests -- Control -- Periodicals; Forest insects -- Control -- Periodicals; 632.7
• DOI: 10.1111/afe.12020
• Languages: English
• ISSNs: 1461-9555

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <p> <list list-type="order"> <list-item> <p>The leaf miner <italic>Cameraria ohridella</italic> and bleeding canker disease (BCD) are invasive organisms causing severe damage to horse‐chestnut trees in Europe.</p> </list-item> <list-item> <p>Their impact and potential interaction were investigated by monitoring infestation and disease symptoms on 193 European horse‐chestnuts <italic>Aesculus hippocastanum</italic> L. and 46 red horse‐chestnuts <italic>Aesculus carnea</italic> J. Zeyh. over a 10‐year period from 2002 to 2012.</p> </list-item> <list-item> <p> <italic>Cameraria ohridella</italic> damaged up to 75% of the total leaf area of <italic>A. hippocastanum</italic>, but it had no influence on stem radial growth or general tree condition. <italic>Aesculus carnea</italic> was rarely attacked and only when growing close to heavily infested <italic>A. hippocastanum</italic>.</p> </list-item> <list-item> <p>BCD, in contrast, was responsible for the death or removal of 11% of <italic>A. hippocastanum</italic> and 27% of <italic>A. carnea</italic>, and surviving trees showed a decrease in growth rate and decline in crown density.</p> </list-item> <list-item> <p> <italic>Cameraria ohridella</italic> was more abundant on larger <italic>A. hippocastanum</italic>, whereas BCD was more prevalent amongst young, fast‐growing <italic>A. hippocastanum</italic>, which resulted in a partial separation of the moth and disease between trees and habitats, as well as in the wider environment.</p> </list-item> <list-item> <p>Trees with higher rates of leaf miner damage generally had a lower incidence of BCD and there was no evidence that <italic>C. ohridella</italic> either facilitated the spread of the disease or accentuated its impact.</p> </list-item> </list> </p> </abstract>