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Please use this identifier to cite or link to this item: http://dspace.utalca.cl/handle/1950/4770

Title: Effect of epicuticular waxes of poplar hybrids on the aphid Chaitophorus leucomelas (Hemiptera : Aphididae)
Authors: Alfaro-Tapia, A.
Verdugo, J.A.
Astudillo, L.
Ramirez, C.C.
Issue Date: 2007
Publisher: Blackwell Synergy
Citation: Journal of applied entomology 131(7): 486 - 492
Abstract: Insect response to plant surface features is a critical step in host-finding and acceptance of herbivorous insects. The plant surface is usually covered with epicuticular waxes (EWs), which are not only involved in water physiology, but also provide resistance to insects. In the present work the probing behaviour and performance of the aphid Chaitophorus leucomelas Koch (Hemiptera: Aphididae) on dewaxed and waxed leaves of two poplar hybrids, [(Populus trichocarpa Torr. & Gray × Populus deltoides Bartram ex Marshall) × P. deltoides] (TD × D) and [(P. trichocarpa × Populus maximowiczii Henry) × (P. trichocarpa × P. maximowiczii)] (TM × TM), previously reported as susceptible and resistant, respectively, are described. Laboratory experiments showed that in naturally waxed leaves of the resistant hybrids, aphids devoted less time to probing and more time to non-probing behaviour when compared with their behaviour on susceptible hybrids. These differences were not present when leaves of these hybrids were experimentally dewaxed. A field experiment demonstrated that aphid reproductive performance was affected by hybrid genotype (higher in the TD × D) but not by EWs, although a trend of lower performance on dewaxed leaves in both hybrids was apparent. SEM analysis of EWs revealed micromorphological differences between both hybrids. These results support the idea that EWs affect aphid behaviour in poplars, with a rather slight impact on reproductive performance.
Description: Ramirez,C.C. Instituto de Biología Vegetal y Biotecnología, Universidad de Talca, Talca, Chile; Astudillo, L. Laboratorio de Síntesis Orgánica, Instituto de Química de Recursos Naturales, Universidad de Talca, Talca, Chile.
URI: http://dspace.utalca.cl/handle/1950/4770
ISSN: 0931-2048
Appears in Collections:Artículos en publicaciones ISI - Universidad de Talca

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