Spatial and temporal variability in defoliation of Australian eucalypts

Insect defoliation is commonly associated with and assumed to be a cause of mortality in Australian eucalypts, particularly in rural regions where trees suffer from the eucalypt dieback syndrome. To test this, leaf growth and defoliation were measured in the canopies of Eucalpyptus trees from June 1...

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Bibliographic Details
Published in:Ecology (Durham) 1992-02, Vol.73 (1), p.129-142
Main Authors: Lowman, M. D., Heatwole, Harold
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
Botany
Branches
CAIDA DE LAS HOJAS
CANOPY
CHUTE DES FEUILLES
CONTROLE CONTINU
COUVERT
CUBIERTA DE COPAS
Defoliation
DEPERISSEMENT TERMINAL
DIEBACK
EUCALYPTUS
Forest canopy
Fundamental and applied biological sciences. Psychology
Herbivores
Infestation
INSECTE NUISIBLE
INSECTOS DANINOS
Insects
LEAF FALL
Leaves
MARCHITEZ DESCENDENTE
MONITORING
NEW SOUTH WALES
NOUVELLE GALLES DU SUD
NUEVA GALES DEL SUR
Pastures
PEST INSECTS
Physiological diseases. Varia
Phytopathology. Animal pests. Plant and forest protection
Phytophagous insects
SPATIAL VARIATION
TEMPORAL VARIATION
Trees
VIGILANCIA
Woodlands
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Summary:Insect defoliation is commonly associated with and assumed to be a cause of mortality in Australian eucalypts, particularly in rural regions where trees suffer from the eucalypt dieback syndrome. To test this, leaf growth and defoliation were measured in the canopies of Eucalpyptus trees from June 1982 to June 1986, and related to tree health and eucalypt dieback. Over 5000 leaves were monitored, including replicates of branches, canopy heights, individual trees, species, and sites. Three types of sites were selected, representing the most common conditions in the eastern Australian tablelands: woodlands (comprised of healthy trees but with slight signs of dieback), healthy trees in pastures, and dying trees in pastures. Within each site the commonest native tree species were selected for study; species were not always the same between adjacent sites because of interspe_kw canopy
ISSN:0012-9658
1939-9170
DOI:10.2307/1938726