Journal Article

Canyon Drift and Dispersion of Bacillus thuringiensis and Its Effects on Select Nontarget Lepidopterans in Utah

Wayne H. Whaley, John Anhold and G. Bruce Schaalje

in Environmental Entomology

Published on behalf of Entomological Society of America

Volume 27, issue 3, pages 539-548
Published in print June 1998 | ISSN: 0046-225X
Published online September 2014 | e-ISSN: 1938-2936 | DOI:
Canyon Drift and Dispersion of Bacillus thuringiensis and Its Effects on Select Nontarget Lepidopterans in Utah

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A study was conducted to determine the effects of Bacillus thuringiensis Berliner var. kurstaki drift on 2 lepidopteran species, Incisalia fotis Strecker and Callophrys sheridanii W. H. Edwards, and to test the efficacy of exclusion plots for mitigation on Neominois ridingsii W. H. Edwards. Incisalia fotis and C. sheridanii experienced significant mortality from drift when fed host plants placed up to 3,000 m from the down-canyon edge of the application site. Drift concentrations and mortality were greatest near the boundary of the application site, although they sometimes varied in an inconsistent manner. The 1993 bioassay data correlate with the observed reduction in adult I. fotis populations following B. thuringiensis applications during previous years. An exclusion plot established for N. ridingsii failed to provide protection. All 3 species are concluded to be sensitive to B. thuringiensis and mitigative procedures are warranted during gypsy moth (Lymantria dispar L.) eradication or suppression projects when the projects encompass large tracts of their respective ranges. Because of the lethal dosages of insecticide drift observed on larval host plants, it is concluded that mitigation procedures such as establishment of exclusion plots may not provide protection for B. thuringiensis-sensitive nontarget species when steep mountainous terrain is involved. Under these conditions other approaches may be warranted.

Keywords: Incisalia fotis; Callophrys sheridanii; toxicology; Bacillus thuringiensis; gypsy moth; nontarget Lepidoptera

Journal Article.  0 words. 

Subjects: Entomology

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