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Deposition Characteristics of Aerially Applied Bacillus thuringiensis to a Hardwood Forest with Hydraulic Nozzles

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Deposit measurements (international units [lUI per em') were made on foliage after aerial application of Bactllus thurlngiensts Berliner to hardwood forests. The quantities of spray arriving above each tree (collected by artificial collectors above the canopy) and between the canopies of individual trees in the same spray block were highly variable. Spray deposition in average upper and lower canopy strata and cardinal positions within each strata also were variable, but overall deposit was not significantly different. Deposits, averaged over plot, were 1.35 (±O.07) and 1.26 (±O.11) log IV per em' for the upper and lower canopy, respectively. The rank order of deposits changed among strata and positions within strata such that no consistent pattern of deposition could be found between trees. However, because the upper canopy contained a greater foliage area, more B. thurlngiensts was caught in the upper canopy (3.70 x 107 IV per tree) compared with the lower canopy (2.03 x 107 IU per tree). Overall recovery of the spray applied was 55.2% on the foliage and 6.0% at the ground level. Spray that was not accounted for was probably either deposited on the trunk and branches or drifted from the spray plot. Distribution of deposit between individual leaves closely conformed to a log-normal distribution.

Document Type: Research Article

Publication date: April 1, 1991

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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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