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Laboratory and field evaluation of efficacy of VectoBac 12AS against Culex sitiens (Diptera: Culicidae) larvae

Brown, M.D.; Thomas, D.; Watson, K.; Kay, B.H.

Journal of the American Mosquito Control Association 14(2): 183-185

1998

ISSN/ISBN: 8756-971X
PMID: 9673920
Document Number: 497441
Laboratory bioassay studies of the efficacy of VectoBac 12AS (active ingredient: 1200 ITU/mg Bacillus thuringiensis subsp. israelensis) against field-collected late 3rd-/early 4th-instar larvae of C. sitiens indicated excellent control potential. A 95% lethal concentration (LC95) value of 1.381x107 ITU was calculated, which equated to a dosage of 0.011 litres/ha. This dosage represented 1.8% of the recommended lowest dosage rate for the product. A field trial of VectoBac 12AS against late 3rd-/early 4th-instar field specimens of C. sitiens in floating mesh cylinders was then conducted in salt-marsh pools near Coomera Marina, southeast Queensland, Australia. At a rate of 0.5 litres/ha, 100% mortality of C. sitiens larvae was recorded at 24 h posttreatment.

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