Variation amongEucalyptus species in resistance to eucalyptus longhorned borer in Southern California |
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Authors: | Lawrence M Hanks Timothy D Paine Jocelyn G Millar and John L Hom |
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Institution: | (1) Department of Entomology, University of California, 92521 Riverside, CA, USA;(2) Northeastern Forest Experiment Station, USDA Forest Service, 5 Radnor Corporate Center, 100 Matsonford Rd., Suite 200, 19087-4585 Radnor, PA, USA |
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Abstract: | Eucalyptus L'Héritier (Myrtaceae: Leptospermoideae) species are native to the Austro-Malaysian region, but have been widely planted
in temperate and subtropical regions around the world. In most regions whereEucalyptus have been imported, the Eucalyptus Longhorned Borer (Phoracantha semipunctata F.) (Coleoptera: Cerambycidae) has been accidently introduced. Larvae of the beetle bore through the bark and mine along
the cambium of stressed trees, usually killing their host. We report here the relative susceptibilities of 12Eucalyptus species in two mixed-species plantations in California, USA. These trees were stressed by water deficit resulting from a
prolonged drought.Eucalyptus species that appeared resistant to the borer includedE. camaldulensis Dehnhardt,E. cladocalyx F. Muller,e. sideroxylon A. Cunn. ex Woolls, andE. trabutii (anE. camaldulensis hybrid). Species that were more susceptible to attack wereE. diversicolor F. Mueller,E. globulus LaBillardière,E. grandis Hill ex Maiden,E. nitens (Deane & Maiden),E. saligna Sm., andE. viminalis LaBillardière. Survival of trees was influenced by fine-scale moisture variation resulting from slope and irrigation effects.
Resistance characteristics of theseEucalyptus species did not correlate with taxonomic relatedness or bark characteristics, but did correspond to drought tolerance traits
in their native habitat.Eucalyptus species that were resistant to attack byP. semipunctata were those that are most tolerant of drought in Australia. |
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Keywords: | Eucalyptus Longhorned Borer Phoracantha semipunctata Cerambycidae wood-boring insects herbivorous insects Eucalyptus plant defense water stress drought stress |
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