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Penetration of Oak Canopies by a Commercial Preparation of Bacillus thuringiensis Applied by Air

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The volume of spray deposit throughout an oak canopy was measured at a single-leaf resolution. Profiles of deposit (international units per cm2) are compared for upper and lower-canopy levels and positions within these levels. Droplet sizes and densities are shown for upper- and lower-canopy levels. Artificial targets were used to measure the deposit at ground level, the deposit on a horizontal profile at midcrown, and the deposit over a vertical profile from the canopy top to the ground. No significant differences were found between the levels or positionsin the canopy (P > 0.05). However, highly significant variation was shown among sample trees (P < 0.001).The distribution of dose among individual leaves was shown to be highly variable with approximately a lognormal distribution.

Document Type: Research Article

Publication date: February 1, 1990

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  • 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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