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INFLUENCE OF THE GREEN SPRUCE APHID ON DEFOLIATION AND RADIAL STEM GROWTH OF SITKA SPRUCE

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

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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Abstract

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 Environmental Sciences
Research Institutes and Groups:Environmental Sciences Research Institute
Environmental Sciences Research Institute > Terrestrial Ecology
ID Code:2356
Deposited By:Professor Keith Day
Deposited On:01 Feb 2010 21:43
Last Modified:21 Jul 2011 16:34

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