Journal of Economic Entomology (2014) 107, 268-276

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Joceline Barrios-San Martín, Andrés Quiroz, Jaime A. Verdugo, Leonardo Parra, Emilio Hormazabal, Luis A. Astudillo, Marcelo Rojas-Herrera and Claudio C. Ramírez (2014)
Host selection and probing behavior of the poplar aphid Chaitophorus leucomelas (Sternorrhyncha: Aphididae) on two poplar hybrids with contrasting susceptibility to aphids
Journal of Economic Entomology 107 (1), 268-276
Abstract: Poplars are frequently attacked by aphids. The differential susceptibility of poplar hybrids to the aphid Chaitophorus leucomelas Koch (Sternorrhyncha: Aphididae) has been described, but the mechanism underlying this pattern is unknown. This work tested the hypothesis that poplar resistance to this aphid is associated with the presence of volatiles and secondary plant compounds that affect host selection and feeding behavior. This hypothesis was tested by studying the host choice and feeding be havior of C. leucomelas on two poplar hybrids with contrasting susceptibilities to this aphid ([Populus trichocarpa Torrey and Gray × Populus deltoides Bartram ex Marshall] × P. deltoides [TD × D] , and [P. trichocarpa × Populus maximowiczii Henry] × [P. trichocarpa × P. maximowiczii] [TM × TM]). The results showed that C. leucomelas rejected leaves of the TM × TM hybrid and did not prefer odors from either hybrid. Electronic monitoring of the probing behavior of C. leucomelas suggested the involvement of antifeedant factors in the TM × TM hybrid. In addition, the chemical characterization of volatiles, epicuticular waxes, and internal phenols of leaves from both poplar hybrids revealed that TM × TM had a higher abundance of monoterpenes, sesquiterpenes, n-alkanes, and phenols. These results are discussed in terms of their contribution to poplar breeding programs aimed at enhancing insect resistance.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Claudio C. Ramirez

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Chaitophorus leucomelas Poplar/aspen (Populus) Chile (continental)
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