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EFFICACY AND FIELD PERSISTENCE OF BACILLUS THURINGIENSIS AFTER GROUND APPLICATION TO BALSAM FIR AND WHITE SPRUCE IN WISCONSIN

Published online by Cambridge University Press:  31 May 2012

R. C. Reardon  and
K. Haissig
R. C. Reardon
Affiliation:
Pacific Southwest Forest and Range Experiment Station, Forest Service, USDA, Davis, California 95616
K. Haissig
Affiliation:
Wisconsin Department of Natural Resources, Rhinelander, Wisconsin 54409
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Abstract

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Bacillus thuringiensis was applied at three dosages (1.0 BIU/tree, 0.1 BIU/tree, and.01 BIU/tree) to balsam fir, Abies balsamea (L.) Mill., and white spruce, Picea glauca (Moench) Voss, with mist blowers. Crystalline proteins were detected on balsam fir foliage for a maximum of 16 days (d) after B. thuringiensis was applied at 1.0 BIU/tree. Higher levels of crystalline proteins were detected on white spruce foliage treated with Thuricide 16B than on that treated with Dipel 4L. On balsam fir, the situation was the opposite. Mist-blower-treated foliage collected for up to 16 d posttreatment caused mortality of spruce budworm, Choristoneura fumiferana (Clemens), larvae. Viable endospores of B. thuringiensis were recovered on white spruce foliage collected 1 year after treatment.

Résumé

Bacillus thuringiensis a été appliqué à 3 doses (1.0 BIU/arbre; 0.1 BIU/arbre et.01 BIU/arbre) sur le sapin, Abies balsamea (L.) Mill., et l'épinette blanche, Picea glauca (Moench) Voss, à l'aide de brumisateurs. Les cristaux protéiques ont été détectés sur le feuillage pendant 16 jours (d) au maximum après l'application de 1.0 BIU/arbre. Des niveaux plus élevés de cristaux protéiques ont été détectés sur le feuillage de l'épinette blanche traité au Thuricide 16B que sur celui traité au Dipel 4L. Sur le sapin baumier, la situation inverse s'est présentée. Du feuillage traité au brumisateur et prélevé jusqu'à 16 jours après le traitement a causé de la mortalité chez des larves de tordeuse, Choristoneura fumiferana (Clemens). Des endospores viables de B. thuringiensis ont été trouvées sur du feuillage d'épinette blanche prélevé 1 an après le traitement.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 2 , February 1984 , pp. 153 - 158
Copyright
Copyright © Entomological Society of Canada 1984

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