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RELATING WEATHER TO OUTBREAKS OF WESTERN SPRUCE BUDWORM, CHORISTONEURA OCCIDENTALIS (LEPIDOPTERA: TORTRICIDAE), IN BRITISH COLUMBIA

Published online by Cambridge University Press:  31 May 2012

A. J. Thomson ,
R. F. Shepherd ,
J. W. E. Harris  and
R. H. Silversides
A. J. Thomson
Affiliation:
Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia V8Z 1M5
R. F. Shepherd
Affiliation:
Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia V8Z 1M5
J. W. E. Harris
Affiliation:
Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia V8Z 1M5
R. H. Silversides
Affiliation:
Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia V8Z 1M5
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Abstract

The relationship of western spruce budworm outbreaks and population collapse to weather parameters was examined using long term weather records from two stations in the budworm outbreak area of British Columbia and outbreak patterns obtained from Forest Insect and Disease Survey records and from tree stem analyses.

Outbreaks were associated with warm dry summers in conjunction with synchrony of larval emergence and bud flush. Collapse of the last two outbreaks was clearly associated with extreme high temperatures following moth flight. Collapse of the earlier outbreaks may have been due to asynchrony between larval emergence and bud flush.

Résumé

Les auteurs ont étudié le rapport entre des paramètres météorologiques et les pullulations et effondrements des populations de la tordeuse occidentale de l'épinette. Ils ont utilisé pour leur analyse les données météorologiques enregistrées sur une longue période par deux stations situées dans la zone d'infestations en Colombie-Britannique et les données sur les caractéristiques des infestations obtenues des relevés des insectes et des maladies des arbres et des analyses de la tige.

Ils ont trouvé que les pullulations étaient reliées à des étés secs associés au synchronisme de l'apparition des larves et de la sortie des bourgeons. L'effondrement des deux dernières pullulations est nettement associable à des températures élevées extrêmes après l'envol des papillons. La non-coïncidence de l'émergence des larves et de la sortie des bourgeons a pu causer l'effondrement des pullulations antérieures.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 3 , March 1984 , pp. 375 - 381
Copyright
Copyright © Entomological Society of Canada 1984

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References

Alfaro, R. I., Van Sickle, G. A., Thomson, A. J., and Wegwitz, E.. 1982. Tree mortality and radial growth losses caused by the western spruce budworm in a Douglas-fir stand in British Columbia. Can. J. For. Res. 12: 780–787.CrossRefGoogle Scholar
Blais, J. R. 1981. Effects of late spring frosts in 1980 on spruce budworm and 13 host trees in the Laurentian Park Region of Quebec. Can. J. For. Serv. Res. Notes 1: 16–17.Google Scholar
Cramer, H. H. 1962. Moeglichkeifen der Forstschaedlingsprognose mit Hilfe meteorologischer Daten. [English title: The possibility of forecasting outbreaks of forest pests with the aid of meteorological data.] Schriftenreihe der Forstlichen Abteilung der Albert-Ludwigs-Universitaet, Freiburg im Breisgau.Google Scholar
Greenbank, D. O. 1956. The role of climate and dispersal in the initiation of outbreaks of the spruce budworm in New Brunswick. I. The role of climate. Can. J. Zool. 34: 453–476.CrossRefGoogle Scholar
Hard, J., Tunnock, S., and Eder, R.. 1980. Western spruce budworm defoliation trend relative to weather in the Northern Region, 1969-1979. U.S. Dep. Agric. For. Serv., Northern Region, St. & Private For. Rep. 80–4.Google Scholar
Henson, W. R. 1950. The means of dispersal of the spruce budworm. Ph.D. Thesis, Yale University.Google Scholar
Ives, W. G. H. 1974. Weather and outbreaks of the spruce budworm, Choristoneura fumiferana (Lepidoptera: Tortricidae). Can. For. Serv., North. For. Res. Centre, Inf. Rep. NOR-X-118.Google Scholar
Ives, W. G. H. 1981. Environmental factors affecting 21 forest insect defoliators in Manitoba and Saskatchewan, 1945–69. Can. For. Serv., North. For. Res. Centre, Inf. Rep. NOR-X-233. 142 pp.Google Scholar
McMorran, A. 1973. Effects of pre-storage treatment on survival of diapausing larvae of the spruce budworm, Choristoneura fumiferana (Lepidoptera: Tortricidae). Can. Ent. 105: 1005–1009.CrossRefGoogle Scholar
Royama, T. 1978. Do weather factors influence the dynamics of spruce budworm populations? Can. For. Serv. Bi-mon. Res. Notes 34: 9–10.Google Scholar
Shepherd, R. F. 1961. A comparison of the developmental rates of one- and two-year cycle spruce budworm. Can. Ent. 93: 764–771.CrossRefGoogle Scholar
Silver, G. T. 1960. Notes on a spruce budworm infestation in British Columbia. For. Chron. 36: 362–374.CrossRefGoogle Scholar
Thomson, A. J. 1979. Evaluation of key biological relationships of western budworm and its host trees. Can. For. Pacif. For. Res. Cen. Inf. Rep. BC-X-186. 19 pp.Google Scholar
Thomson, A. J. and Moncrieff, S. M.. 1982. Prediction of bud burst in Douglas-fir by degree-day accumulation. Can. J. For. Res. 12: 448–452.CrossRefGoogle Scholar
Thomson, A. J. and Van Sickle, G. A.. 1980. Estimation of tree growth losses caused by pest activity. Can. J. For. Res. 10: 176–182.CrossRefGoogle Scholar
Thomson, A. J., Harris, J. W. E., Silversides, R. H., and Shepherd, R. F.. 1983. Effects of elevation on the rate of development of western spruce budworm (Lepidoptera: Tortricidae) in British Columbia. Can. Ent. 115: 1181–1187.CrossRefGoogle Scholar
Van Sickle, G. A., Alfaro, R. I., and Thomson, A. J.. 1983. Douglas-fir height growth affected by western spruce budworm. Can. J. For. Res. 13: 445–450.CrossRefGoogle Scholar
Wagg, J. W. B. 1958. Environmental factors affecting spruce budworm growth. Res. Bull. 11. Forest Lands Research Center, Corvallis, Oregon.Google Scholar
Wellington, W. G. and Henson, W. R.. 1947. Notes on the effects of physical factors on the spruce budworm, Choristoneura fumiferana (Clem.). Can. Ent. 79: 168–170.CrossRefGoogle Scholar
Wellington, W. G., Fettes, T. J., Turner, K. B., and Belyea, R. M.. 1950. Physical and biological indicators of the development of outbreaks of the spruce budworm, Choristoneura fumiferana (Clem.) (Lepidoptera: Tortricidae). Can. J. Res. (D) 28: 308–331.CrossRefGoogle Scholar