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Laboratory and Field Evaluations of <em>Bacillus thuringiensis</em> Berliner Insecticides Against Tobacco Budworm (Lepidoptera: Noctuidae)
C. A. White, B. R. Leonard, E. Burris and J. B. Graves
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Studies were conducted to determine the effectiveness of Bacillus thuringiensis (Dipel ES, Condor OF) Berliner insecticides in controlling the tobacco budworm, Heliothis virescens (F.). Laboratory tests (plant terminal bioassays) indicated that Dipel ES and Condor OF rates ≥1.17 L ha-1 produced significantly higher mortality of tobacco budworm larvae than did the untreated control on treated plant tissue harvested 2 h post-treatment. Dipel ES at 4.68 L ha-1 and Condor OF ≤0.58 L ha-1 caused significantly higher tobacco budworm mortality than did the untreated control on treated plant tissue harvested 72 h post-treatment. Tobacco budworm mortality levels did not increase as Dipel ES or Condor OF dosage rates increased. Larvin at 1.17 L ha-1 generally produced mortality levels equal to or higher than those observed with the higher rates of Dipel ES or Condor OF. Field trials evaluating Dipel ES and Condor OF indicated that rates ≥1.17 L ha-1 significantly reduced tobacco budworm damaged squares below that observed in the untreated control.