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DEVELOPMENT OF SAMPLING TECHNIQUES FOR THE SPRUCE BUDMOTH, ZEIRAPHERA CANADENSIS MUT. AND FREE. (LEPIDOPTERA: TORTRICIDAE)

  • Jean J. Turgeon (a1) and Jacques Régnière (a2)

Abstract

The spatial and statistical distribution of Zeiraphera canadensis Mut. and Free. (spruce budmoth) within the crown of white spruce (< 4 m high) was investigated in northern New Brunswick. A 15-cm branch segment, measured distally from the scales of the branch’s apical growth and taken from the upper one-third of the crown, is considered an adequate sample unit for density estimates of spruce budmoth eggs and larvae. Sample sizes required to estimate spruce budmoth larval densities with given levels of precision and confidence were determined. A sequential sampling plan to classify spruce budmoth populations as low or high (potentially leading to growth reduction and deformed leaders in white spruce) was also developed.

La distribution spatiale et statistique de la tordeuse de l’épinette, Zeiraphera canadensis Mut. and Free., dans la cîme d’épinettes blanches (< 4 m), a été étudiée dans le nord du Nouveau-Brunswick. Ces travaux ont permis de déterminer qu’un segment de branche de 15 cm, mesuré à partir des écailles de la pousse apicale vers la base et prélevée dans le 1/3 supérieur de la couronne, est une unité d’échantillonnage adéquate pour l’estimation de la densité des populations d’oeufs ou de larves de cet insecte. Le nombre d’échantillons nécessaires pour l’estimation des densités larvaires à certains niveaux de précision et de confiance a été déterminé. Un plan d’échantillonnage séquentiel permettant de classer les populations de la tordeuse de l’épinette comme faibles ou élevées (pouvant causer une perte de croissance ou la déformation de la flèche chez l’épinette blanche) a aussi été élaboré.

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References

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DEVELOPMENT OF SAMPLING TECHNIQUES FOR THE SPRUCE BUDMOTH, ZEIRAPHERA CANADENSIS MUT. AND FREE. (LEPIDOPTERA: TORTRICIDAE)

  • Jean J. Turgeon (a1) and Jacques Régnière (a2)

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