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

KR Day, S McClean

Research output: Contribution to journalArticle

17 Citations (Scopus)

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.
LanguageEnglish
Pages415-423
JournalAnnals of Applied Biology
Volume119
Issue number3
Publication statusPublished - Dec 1991

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Picea sitchensis
stem elongation
defoliation
Picea
Aphidoidea
Northern Ireland
abscission
population density
stems
leaves

Cite this

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title = "INFLUENCE OF THE GREEN SPRUCE APHID ON DEFOLIATION AND RADIAL STEM GROWTH OF SITKA SPRUCE",
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.",
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INFLUENCE OF THE GREEN SPRUCE APHID ON DEFOLIATION AND RADIAL STEM GROWTH OF SITKA SPRUCE. / Day, KR; McClean, S.

In: Annals of Applied Biology, Vol. 119, No. 3, 12.1991, p. 415-423.

Research output: Contribution to journalArticle

TY - JOUR

T1 - INFLUENCE OF THE GREEN SPRUCE APHID ON DEFOLIATION AND RADIAL STEM GROWTH OF SITKA SPRUCE

AU - Day, KR

AU - McClean, S

PY - 1991/12

Y1 - 1991/12

N2 - 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.

AB - 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.

M3 - Article

VL - 119

SP - 415

EP - 423

JO - Annals of Applied Biology

T2 - Annals of Applied Biology

JF - Annals of Applied Biology

SN - 0003-4746

IS - 3

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