Journal of Economic Entomology (2003) 96, 1786-1791

From Pestinfo-Wiki
Jump to: navigation, search

Tanya L. Russell, Michael D. Brown, David M. Purdie, Peter A. Ryan and Brian H. Kay (2003)
Efficacy of VectoBac (Bacillus thuringiensis variety israelensis) formulations for mosquito control in Australia
Journal of Economic Entomology 96 (6), 1786-1791
Abstract: Laboratory bioassays were conducted on the efficacy of a water-dispersible granule (WG) formulation of Bacillus thuringiensis variety israelensis (VectoBac WG; active ingredient [AI]: 3,000 Bti international toxic units [ITU]/mg) against third instars of six common Australian mosquito species, Aedes aegypti (L.), Ochlerotatus vigilax (Skuse), Ochlerotatus notoscriptus (Skuse), Culex sitiens Wiedemann, Culex annulirostris Skuse, and Culex quinquefasciatus Say. The normal model for log-linear mortality data was used to determine laboratory 48-h LC50 and LC95 values. The target mosquito species tested were extremely sensitive to the VectoBac WG formulation, with the most sensitive species (Cx. annulirostris and Cx. quinquefasciatus, LC95 value of 0.019 ppm) being twice as susceptible as the most tolerant (Oc. notoscriptus, LC95 value of 0.037 ppm). Cx. annulirostris was selected as a target species for a small-plot evaluation of VectoBac WG and VectoBac 12 aqueous solution (AS) ([AI]: 1,200 Bti ITU/mg) efficacy over time, in freshwater in southeastern Queensland, Australia. Replicated cohorts of caged third instars were exposed weekly to six concentrations of WG formulation (0.004-0.13 ppm) and three concentrations of the 12AS formulation (0.04-0.13 ppm). In water with high organic content, treatment concentrations of 0.008 ppm WG and 0.04 ppm 12AS and above produced significant larval control (>96%) at 48 h posttreatment, with no residual control at week 1. Water quality was not affected by treatment with either formulation.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Full text of article
Database assignments for author(s): Tanya L. Russell, Peter A. Ryan, Brian H. Kay

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection
application technology


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Culex quinquefasciatus Australia (NT+QLD)
Culex annulirostris Australia (NT+QLD)
Aedes notoscriptus Australia (NT+QLD)
Aedes vigilax Australia (NT+QLD)
Culex sitiens Australia (NT+QLD)
Aedes aegypti Australia (NT+QLD)
Bacillus thuringiensis var. israelensis (entomopathogen) Culex quinquefasciatus Australia (NT+QLD)
Bacillus thuringiensis var. israelensis (entomopathogen) Culex annulirostris Australia (NT+QLD)
Bacillus thuringiensis var. israelensis (entomopathogen) Aedes notoscriptus Australia (NT+QLD)
Bacillus thuringiensis var. israelensis (entomopathogen) Aedes vigilax Australia (NT+QLD)
Bacillus thuringiensis var. israelensis (entomopathogen) Culex sitiens Australia (NT+QLD)
Bacillus thuringiensis var. israelensis (entomopathogen) Aedes aegypti Australia (NT+QLD)