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- Title
Response of two chemotypes of Melaleuca quinquenervia (Myrtales: Myrtaceae) saplings to colonization by specialist herbivores.
- Authors
Tipping, Philip W.; Martin, Melissa R.; Pratt, Paul D.; Wheeler, Gregory S.; Gettys, Lyn A.
- Abstract
Two chemotypes of Melaleuca quinquenervia (Cav.) S. T. Blake (Myrtales: Myrtaceae) saplings were planted in a common garden under 2 water treatments and exposed to either restricted or unrestricted herbivory from 2 insect herbivores. Chemotypes consisted of either a predominately E-nerolidol terpenoid complex or one that consisted primarily of viridiflorol; both types had influenced the performance or preference of both insect herbivores in laboratory studies. The densities of the 2 specialist herbivores Boreioglycaspis melaleucae Moore (Hemiptera: Psyllidae) and Oxyops vitiosa Pascoe (Coleoptera: Curculionidae) were monitored regularly as they colonized the plantings, as were plant responses like leaf abscission and tree height. Neither the chemotype nor the water treatments influenced the densities of B. melaleucae and O. vitiosa. Trees subjected to unrestricted herbivory shed more leaf biomass than those protected by insecticides from herbivory. There was no relationship between the amount of biomass shed via abscission and the density of either herbivore despite a significant correlation with a damage rating developed for O. vitiosa. There was a chemotype response to herbivory whereby more leaf biomass was shed by the E-nerolidol chemotype than by the viridiflorol chemotype when subjected to unrestricted herbivory. Tree height was influenced by herbivory but not chemotype or water, although there were separate 2-way interactions between all factors. Thus, despite equal herbivore pressure, the response of young M. quinquenervia trees to abiotic and biotic forces diverged at the plant variant level.
- Subjects
MELALEUCA quinquenervia; MELALEUCA; HEMIPTERA; PESTS; DICOTYLEDONS
- Publication
Florida Entomologist (Florida Entomological Society), 2016, Vol 99, Issue 1, p77
- ISSN
0015-4040
- Publication type
Article
- DOI
10.1653/024.099.0114