Residual Toxicity of a High-Potency Formulation of Bacillus thuringiensis to Spruce Budworm (Lepidoptera: Tortricidae)
Authors: RANKENHUYZEN, KEES VAN; NYSTROM, CARL
Source: Journal of Economic Entomology, Volume 82, Number 3, June 1989 , pp. 868-872(5)
Publisher: Entomological Society of America
Abstract:Foliar persistence of an aqueous high-potency formulation of Bacillus thuringiensis (Thuricide 48L V) applied to a white spruce (Picea glauca Moench.) plantation at 2.4 liters/ha was assessed. Residual toxicity of treated foliage to spruce budworm, Choristoneura fumiferana (Clemens), larvae was <2 d despite high spray deposition on the target foliage. Experiments with potted balsam fir indicated that wash-off by rain was the primary cause for loss of residual toxicity, whereas inactivation by sunlight played a limited role. As little as 6 mm of rain caused a substantial loss of residual toxicity. We conclude that deposits of Thuricide 48L V (low viscosity)on white spruce and balsam fir (Ables balsamea L.) foliage are highly susceptible to wash-off by rain. A high concentration of active ingredient does not improve foliar persistence and a suitable sticker is required.
Document Type: Research article
Publication date: 1989-06-01
- Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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