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DISTRIBUTION AND SAMPLING OF ROOT WEEVIL LARVAE IN YOUNG ORNAMENTAL CONIFER PLANTATIONS

Published online by Cambridge University Press:  31 May 2012

J.P. Brandt ,
S.M. Smith  and
M. Hubbes
J.P. Brandt
Affiliation:
Natural Resources Canada, Northwest Region, 5320 - 122 Street, Edmonton, Alberta, Canada T6H 3S5
S.M. Smith
Affiliation:
Faculty of Forestry, University of Toronto, Earth Sciences Centre, 33 Willcocks Street, Toronto, Ontario, Canada M5S 3B3
M. Hubbes
Affiliation:
Faculty of Forestry, University of Toronto, Earth Sciences Centre, 33 Willcocks Street, Toronto, Ontario, Canada M5S 3B3
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Abstract

We determined the distribution of root weevil larvae feeding on the roots of young ornamental conifers in field studies using a new non-destructive sampling technique. Most root weevil larvae fed on the roots during summer, fall, and late spring with significantly more larvae found at 10 cm than at 20 and 30 cm and more at 20 cm than at 30 cm. Larvae moved down into the soil to overwinter and moved closer to the surface (<15 cm) in the spring. Soil samples predicted the population density of larvae under individual trees. Four samples (0.0076 m3), 9 cm in diameter by 30 cm long, taken equidistantly 20 cm from the tree stem provided the best estimate. The equation, T = 64.04 M, where T is the total number of larvae beneath a tree, and M is the mean number of root weevil larvae from four soil samples, described the linear relationship between the number of larvae in soil samples and the total population of larvae beneath a tree. Implications for the timing and location of sampling and control measures are discussed.

Résumé

Nous avons étudié la répartition des larves de charançons dans les racines de jeunes conifères ornementaux au moyen d’une technique d’échantillonnage non perturbante. La plupart des larves se nourrissaient de racines durant l’été, l’automne et à la fin du printemps et il y avait significativement plus de larves à 10 cm qu’à 20 ou à 30 cm et plus à 20 qu’à 30 cm de profondeur. Les larves s’enfonçaient dans le sol pour passer l’hiver et revenaient vers la surface (<15 cm) au printemps. Des échantillons de sol ont servi à faire des prédictions sur la densité des larves au pied d’arbres en particulier. Le prélèvement de quatre échantillons (0,0076 m3) de 9 cm de diamètre et de 30 cm de longueur à équidistances de 20 cm du tronc est la stratégie qui a donné les meilleures estimations. L’équation T = 64,04 M, où T est le nombre total de larves sous un arbre et M, le nombre moyen de larves de charançons des racines dans quatre échantillons de sol, décrit la relation linéaire entre le nombre de larves dans les échantillons de sol et la population totale de larves sous un arbre. Le moment idéal et le site optimal d’échantillonnage et les mesures de lutte à utiliser contre les charançons font l’objet d’une discussion.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 128 , Issue 6 , December 1996 , pp. 1125 - 1133
Copyright
Copyright © Entomological Society of Canada 1996

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