Hostname: page-component-78c5997874-j824f Total loading time: 0 Render date: 2024-11-20T02:48:43.260Z Has data issue: false hasContentIssue false
  • English
  • Français

Sampling plan for Adelges cooleyi (Hemiptera: Adelgidae) in spruce seed orchards

Published online by Cambridge University Press:  02 April 2012

Ward B. Strong  and
Robert G. Bennett
Ward B. Strong*
Affiliation:
British Columbia Ministry of Forests, 3401 Reservoir Road, Vernon, British Columbia, Canada V1B 2C7
Robert G. Bennett
Affiliation:
British Columbia Ministry of Forests, 7380 Puckle Road, Saanichton, British Columbia, Canada V8M 1W4
*
1 Corresponding author (e-mail: [email protected]).
Get access Rights & Permissions [Opens in a new window]

Abstract

Within-plant and between-plants distributions of the Cooley spruce gall adelgid, Adelges cooleyi (Gillette), fundatrices were measured in “interior spruce”, Picea glauca × P. engelmannii (Moench) Voss. & Parry (Pinaceae), seed orchards in central British Columbia to develop a quantitative sampling plan. Adelgids (number of fundatrices per shoot) were abundant at the lower and middle crown heights of the tree crowns but scarce at the upper crown height, and more abundant on the ends and central one-third of branches than on the inner portions. The northern and eastern aspects of trees had slightly but significantly more adelgids than did the southern and western aspects, and terminal shoots had more adelgids than did distolateral shoots. Variance was much greater between than within trees. These data were used to create a sampling plan with a sample unit consisting of a single 1-year-old shoot selected from the ends or central area of main branches in the lower or middle portion of each sample tree. Collecting 104 samples required 69 min, and yielded an estimate of the mean number of fundatrices per shoot with a standard error of 10% of the mean.

Résumé

Nous avons mesuré la répartition sur les plantes et entre les plantes des fondatrices du puceron de l'épinette de Sitka, Adelges cooleyi (Gillette) dans des pépinières à graines de l'«épinette de l'intérieur», Picea glauca × P engelmanni (Moench) Voss. et Parry (Pinaceae), dans le centre de la Colombie-Britannique, afin de mettre au point un plan quantitatif d'échantillonnage. Les adelgidés (fondatrices/tige) sont abondants aux niveaux inférieurs et moyens de la cime des arbres, mais rares dans les niveaux supérieurs; ils sont plus abondants à l'extrémité et sur le tiers central des branches que sur les sections internes. Les expositions nord et est des arbres portent une densité un peu plus élevée, mais significative, d'adelgidés que les expositions sud et ouest et les pousses terminales portent plus d'adelgidés que les pousses disto-latérales. La variance entre les arbres est beaucoup plus importante que la variance sur un même arbre. Ces données ont servi à bâtir un plan d'échantillonnage qui comprend comme unité d'échantillonnage une seule pousse âgée d'une année sélectionnée sur les bouts ou le centre de branches principales dans la région inférieure ou médiane de chaque arbre échantillonné. La récolte de 104 échantillons requiert 69 min. et permet de faire une estimation du nombre moyen de fondatrices par tige avec une erreur type de 10% de la moyenne.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 142 , Issue 1 , February 2010 , pp. 14 - 23
Copyright
Copyright © Entomological Society of Canada 2010

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Baurant, R. 1975. Les Chermesidae sur epicea: la mortalite des fondatrices hivernantes. Bulletin des Recherches Agronomique Gembloux, 10: 399–418.Google Scholar
Cranshaw, W.S. 1989. Patterns of gall formation by the cooley spruce gall adelgid on Colorado blue spruce. Journal of Arboriculture, 15: 277–280.Google Scholar
Cumming, M.E.P. 1959. The biology of Adelges cooleyi (Gill.) (Homoptera: Phylloxeridae). The Canadian Entomologist, 91: 601–617.Google Scholar
Fay, P.A., and Whitham, T.G. 1990. Within-plant distribution of a galling adelgid (Homoptera: Adelgidae): the consequences of conflicting survivorship, growth, and reproduction. Ecological Entomology, 15: 245–254.CrossRefGoogle Scholar
Fidgen, J.G., Teerling, C.R., and McKinnon, M.L. 1994. Intra- and inter-crown distribution of the eastern spruce gall adelgid, Adelges abietis (L.), on young white spruce. The Canadian Entomologist. 126: 1105–1110.CrossRefGoogle Scholar
Foottit, R.G., and Richards, W.R. 1993. The insects and arachnids of Canada. Part 22. The genera of the aphids of Canada — Homoptera: Aphidoidea and Phylloxeroidea. Publication No. 1885, Research Branch, Agriculture Canada, Ottawa, Ontario.Google Scholar
Furniss, R.L., and Carolin, V.M. 1977. Western forest insects. Miscellaneous Publication No. 1339, United States Department of Agriculture, Forest Service, Washington, District of Columbia.Google Scholar
Johnson, W.T., and Lyon, H.H. 1991. Insects that feed on trees and shrubs. Cornell University Press, Ithaca, New York.Google Scholar
Pedigo, L.P. 1996. Entomology and pest management. Prentice–Hall, Saddle River, New Jersey.Google Scholar
SAS Institute Inc. 1996. SAS/STAT guide for personal computers. Version 6.12. SAS Institute Inc., Cary, North Carolina.Google Scholar
Shorthouse, J.D., and Rohfritsch, O. 1992. Biology of insect-induced galls. Oxford University Press, New York.Google Scholar
Southwood, T.R.E. 1978. Ecological methods. Chapman and Hall, New York.Google Scholar
Steel, G.D., and Torrie, J.H. 1960. Principles and procedures of statistics. McGraw-Hill Book Company, New York.Google Scholar
Wood, C. 1977. Cooley spruce gall aphid. Pacific Forestry Center Pest Leaflet No. 6, Canadian Forestry Service, Environment Canada, Victoria, British Columbia.Google Scholar