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

  • Ward B. Strong (a1) and Robert G. Bennett (a2)

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.

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]

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Corresponding author

1 Corresponding author (e-mail: ward.strong@gov.bc.ca).

References

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

  • Ward B. Strong (a1) and Robert G. Bennett (a2)

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