Laboratory and field evaluation of efficacy of VectoBac 12AS against Culex sitiens (Diptera: Culicidae) larvae.
Laboratory bioassay studies of the efficacy of VectoBac 12AS (active ingredient: 1,200 International Toxic Units [ITU]/mg Bacillus thuringiensis var. israelensis) against field-collected late 3rd/early 4th-instar larvae of Culex sitiens indicated excellent control potential. A 95% lethal concentration (LC95) value of 1.381 x 10(7) ITU was calculated, which equated to a dosage of 0.011 liters/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 Cx. sitiens in floating mesh cylinders was then conducted in salt-marsh pools near Coomera Marina, southeast Queensland, Australia. At a rate of 0.5 liters/ha, 100% mortality of Cx. sitiens larvae was recorded at 24 h posttreatment.
Queensland Institute of Medical Research, Royal Brisbane Hospital, Australia.
M D
MD
Brown
D
D
Thomas
K
K
Watson
B H
BH
Kay
D000818:Animals; D001413:Bacillus thuringiensis; D003465:Culex; D010572:Pest Control, Biological / Q000379:methods*; D011793:Queensland