Day, KR and McClean, S (1991) INFLUENCE OF THE GREEN SPRUCE APHID ON DEFOLIATION AND RADIAL STEM GROWTH OF SITKA SPRUCE. ANNALS OF APPLIED BIOLOGY, 119 (3). pp. 415-423. [Journal article]
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Premature abscission of older Sitka spruce foliage on trees within forests in Northern Ireland was compared with green spruce aphid population levels 2 to 3 months earlier. Each aphid has a lower relative impact on needle loss at higher aphid population density; nevertheless, more aphids on a tree results in greater rates of needle loss. Evidence from horizontal stem increment sequences suggested that aphid feeding inhibited incremental growth, and that this inhibition might be delayed for up to two field seasons. However, the effect of aphids on stem growth in most years and on most trees seems relatively small compared with the potential of other tree- or year-specific processes.
|Item Type:||Journal article|
|Faculties and Schools:||Faculty of Life and Health Sciences|
Faculty of Life and Health Sciences > School of Geography and Environmental Sciences
|Research Institutes and Groups:||Environmental Sciences Research Institute > Terrestrial Ecology|
Environmental Sciences Research Institute
|Deposited By:||Professor Keith Day|
|Deposited On:||01 Feb 2010 21:43|
|Last Modified:||21 Jul 2011 15:34|
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