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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

  • R.J. West (a1), A.G Raske (a1), A. Retnakaran (a1) and K.P. Lim (a1)
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%.

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%.

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References
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The Canadian Entomologist
  • ISSN: 0008-347X
  • EISSN: 1918-3240
  • URL: /core/journals/canadian-entomologist
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