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  • 1
    Electronic Resource
    Electronic Resource
    Variation amongEucalyptus species in resistance to eucalyptus longhorned borer in Southern California (1995)
    Springer
    Entomologia experimentalis et applicata 74 (1995), S. 185-194 
    Details
    ISSN: 1570-7458
    Keywords: Eucalyptus Longhorned Borer ; Phoracantha semipunctata ; Cerambycidae ; wood-boring insects ; herbivorous insects ; Eucalyptus ; plant defense ; water stress ; drought stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02383010
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  • 2
    Electronic Resource
    Electronic Resource
    Mating behavior of the eucalyptus longhorned borer (Coleoptera: Cerambycidae) and the adaptive significance of long “horns” (1996)
    Springer
    Journal of insect behavior 9 (1996), S. 383-393 
    Details
    ISSN: 1572-8889
    Keywords: Cerambycidae ; Phoracantha semipunctata ; antennae ; mating behavior ; male aggression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sexual dimorphism in insect antennal structure is often attributed to differences between the sexes in sensitivity to pheromones, the antennae of one sex being more elaborately structured (for example, plumose). Males of the family Cerambycidae (order Coleoptera) often have longer antennae than females, but of a similar general structure, suggesting that selective factors other than sensitivity to pheromones are at work. Both sexes of the eucalyptus longhorned borer, a cerambycid, were attracted to eucalyptus logs that were larval hosts. There, males located females by antennal contact, and male mating success therefore depended on the walking rate and width of the antennal spread. Elongate antennae may benefit males by increasing antennal spread width, but have no such advantage for females, suggesting an evolutionary explanation for sexual dimorphism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02214017
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  • 3
    Electronic Resource
    Electronic Resource
    Body size influences mating success of the Eucalyptus longhorned borer (Coleoptera: Cerambycidae) (1996)
    Springer
    Journal of insect behavior 9 (1996), S. 369-382 
    Details
    ISSN: 1572-8889
    Keywords: insect ; mating ; body size ; male competition ; associative mating ; Cerambycidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Both sexes of adultPhoracantha semipunctata F. (Coleoptera: Cerambycidae) congregate on stressedEucalyptus that are the larval hosts. In a field study, 721 adultP. semipunctata captured on host trees varied considerably in body size with the largest individuals being about twice the length of the smallest. Females that were paired with a mate were similar in size to solitary females, suggesting that the probability of a female being mated was not affected by her size. However, large males had greater success than smaller males in obtaining mates. MaleP. semipunctata rely on antennal contact to locate and identify females on the larval host. Therefore, the rate at which males search for mates is a function of the area swept by their antennae per unit time. Because of their greater antennal spread, large males were able to search for females at double the rate of the smallest males. Large males also dominated in aggressive contests for females. The superior abilities of large maleP. semipunctata in both locating and defending mates account for the influence of body size on mating success.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02214016
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