Volatile emissions from the flea beetle Altica litigata (Coleoptera: Chrysomelidae) associated with invasive Ludwigia hexapetala |
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Authors: | Raymond I Carruthers Marie K Franc Wai S Gee Allard A Coss�� Brenda J Grewell John J Beck |
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Institution: | (1) USDA-ARS Plant Mycotoxin Research, 800 Buchanan Street, Albany, CA 94710, USA;(2) USDA-ARS Exotic and Invasive Weeds Research, 800 Buchanan Street, Albany, CA 94710, USA;(3) USDA-ARS Crop Bioprotection Research, 1815 N. University Street, Peoria, IL 61604, USA;(4) Department of Plant Sciences, USDA-ARS Exotic and Invasive Weeds Research, Mail Stop 4, University of California, Davis 1 Shields Avenue, Davis, CA 95616, USA; |
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Abstract: | The flea beetle Altica litigata (Chrysomelidae) is an insect herbivore to plants within the families Lythraceae and Onagraceae, including ornamentals such
as crape myrtle, Lagerstroemia spp. This insect is important both as a pest species and as a naturally occurring biological control agent due to its aggregate
feeding behavior, which typically results in severe defoliation of the host plant. Despite the negative economic impact to
ornamentals and contrary benefits as a biological control agent, there are few reports on the semiochemical communication
of this family of insects. Uruguayan primrose-willow (Ludwigia hexapetala) is an invasive aquatic weed in California and serves as a host to A. litigata. To better characterize this association, the volatile emissions of A. litigata were collected while the flea beetles were: in containers by themselves, in containers with L. hexapetala leaves, in situ on L. hexapetala leaves in a growth chamber, and in situ on L. hexapetala leaves in the field. For comparison, the volatile emissions of A. litigata associated with two subspecies of creeping water primrose (L. peploides) were also evaluated. Two himachalene-type sesquiterpenes, showing the same carbon skeleton as compounds previously reported
from Aphthona flava and Epitrix fuscula, were detected as volatiles from A. litigata. |
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