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Title: Resistance and susceptibility to the invasive leaf miner Cameraria ohridella within the genus Aesculus
Author: D'Costa, Lilla Eva
ISNI:       0000 0004 8497 6560
Awarding Body: Royal Holloway, University of London
Current Institution: Royal Holloway, University of London
Date of Award: 2014
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The invasive horse chestnut leaf miner Cameraria ohridella Deschka & Dimic (Lepidoptera: Gracillariidae) was introduced into the UK in 2002 and since then it has spread across the country, causing significant aesthetic damage to the extensively planted horse chestnut (Aesculus hippocastanum L.) trees. Different species of Aesculus show varying susceptibility to the miner and the mechanisms responsible for these differences have not been investigated previously. The present study investigates the host plant range and oviposition choice of C. ohridella in the field and in experimental conditions. The study also investigates which leaf traits may convey resistance to the miner, by comparing leaf physical and chemical characteristics. Results indicate that the preference and performance link in C. ohridella is poor, as the miner lays eggs on host species where the larvae cannot develop. The study also found that both susceptibility to the leaf miner and foliar host chemistry is phylogenetically conserved within the genus Aesculus. Among the leaf physical traits that were investigated in this study, leaf toughness is likely to be an important resistance trait for some species, whereas different traits may convey resistance to others. Overall the study suggests that different resistance mechanisms are present in different species of Aesculus, and that traits which are responsible for female preference can be different from those traits which are important for the developing larvae.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Aesculus ; leafminer ; host preference