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EFFICACY OF VARIOUS BACILLUS THURINGIENSIS BERLINER VAR. KURSTAKI FORMULATIONS AND DOSAGES IN THE FIELD AGAINST THE HEMLOCK LOOPER, LAMBDINA FISCELLARIA FISCELLARIA (GUEN.) (LEPIDOPTERA: GEOMETRIDAE), IN NEWFOUNDLAND

Published online by Cambridge University Press:  31 May 2012

R.J. West ,
A.G Raske ,
A. Retnakaran  and
K.P. Lim
R.J. West
Affiliation:
Newfoundland Forestry Centre, Canadian Forestry Service, PO Box 6028, St. John's, Newfoundland, Canada A1C 5X8
A.G Raske
Affiliation:
Newfoundland Forestry Centre, Canadian Forestry Service, PO Box 6028, St. John's, Newfoundland, Canada A1C 5X8
A. Retnakaran
Affiliation:
Newfoundland Forestry Centre, Canadian Forestry Service, PO Box 6028, St. John's, Newfoundland, Canada A1C 5X8
K.P. Lim
Affiliation:
Newfoundland Forestry Centre, Canadian Forestry Service, PO Box 6028, St. John's, Newfoundland, Canada A1C 5X8
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Abstract

Aerially applied Thuricide 48LV, Thuricide 64B, Futura XLV, and water-based formulations of Bacillus thuringiensis Berliner var. kurstaki (B.t.), were tested for effectiveness to control the hemlock looper, Lambdina fiscellaria fiscellaria (Guen.), in balsam fir, Abies balsamea (L.) Mill., stands. Thuricide 64B, applied twice at a dosage of 30 Billion International Units (BIU) per hectare in 1.78 L/ha, was the most effective, reducing the larval population by 100%.

Résumé

On a effectué des tests visant à évaluer l’efficacité de formulations aqueuses de Bacillus thuringiensis Berliner var. kurstaki (B.t.), Thuricide 48LV, Thuricide 64B et Futura XLV, épandues par voie aérienne pour la lutte contre l’arpenteuse de la pruche (Lambdina fiscellaria fiscellaria [Guen.]) dans des peuplements de sapin baumier (Abies balsamea [L.] Mill.). Ces tests ont révélé que le Thuricide 64B, appliqué en deux arrosages à la dose de 30 milliards d’unités internationales par hectare, ou 1,78 L/ha, était la formulation la plus efficace, réduisant la population de larves de 100%.

Type
Articles
Information
The Canadian Entomologist , Volume 119 , Issue 5 , May 1987 , pp. 449 - 458
Copyright
Copyright © Entomological Society of Canada 1987

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