VectoBac WDG (known in some markets as WG) is a water-dispersible granule formulation of Bacillus thuringiensis subsp. israelensis (strain AM65-52) for control of mosquito larvae. The product has a potency of 3,000 International Toxin Units (ITU) per milligram against Aedes aegypti larvae. It is designed for use in aqueous spray mixes and for direct application. VectoBac WDG was the first bacterial larvicide to complete the World Health Organization Pesticide Evaluation Scheme.
Consisting of only Bti (strain AM65-52) and food-grade (US EPA list 4) inert ingredients, VectoBac WG has received approval for application in organic crops (U.S.: Organic Materials Review Institute [OMRI] approved) and sensitive habitats in various countries around the world. This versatile formulation allows a variety of application modes and uses for mosquito control.
Container species such as Aedes aegypti and Aedes albopictus are a major source of concern for mosquito abatement agencies across the globe due to their large vectoral capacity. In addition, adulticiding these species can be quite difficult based on their flight times and other behaviors. Various application methods of VectoBac WG allow for an effective supplement to Integrated Vector Management (IVM) programs aimed at reducing these species that have the capacity to transmit dengue, chikungunya, yellow fever, as well as other arboviruses.
Apply directly (undiluted) to water reservoirs with a volume capacity of >13.2 gallons (50 L). Application rates of 2–8 g per 264 gallons (1000 Liter) of container capacity (100–400 mg/50 L) should be used depending on habitat conditions and program objectives. Application may be made with a calibrated scoop or spoon.
Applications — Ground (Backpack)
Backpack spray application can be utilized to cover relatively large areas (spray blocks), while targeting the spray to known or suspected habitats within the block. Spray application can also be targeted strategically to areas of special concern, areas of high virus transmission (hot spots), or where populations of container mosquitoes are high due to the presence of extensive container mosquito sources.
These types of applications for control of container mosquitoes are highly specialized. For ground (truck) applications, this approach has only just recently (within the last five years) been implemented operationally in Southeast Asia, with the U.S. and Europe currently in the development phase. In 2009, the Florida Keys Mosquito and Vector Control District (U.S.) implemented the world’s first aerial larviciding program to control dengue vectors on a large scale. If you are interested in finding out more about this approach, please contact our technical development team for further information.
For general mosquito control, VectoBac WG can be applied as an aqueous spray application using conventional ground and aerial application equipment to habitats with little or no vegetation. Rate selected should be based on habitat, larval population/stage, and/or environmental conditions.
Suggested Rate Range:
- Natural floodwater and agricultural sites: 50–200 g/acre (125–500 g/ha)
- Polluted water: 200–400 g/acre (0.5–1.0 kg/ha)
- Dry formulation
- Mixes easily in water
- First and only bacterial larvicide to be certified by the WHO Pesticide Evaluation Scheme
- Effective in direct application for residual control of container mosquitoes
- Effective in ground and aerial spray application as aerosol or mist droplets for wide-area control of container mosquitoes
- Highly specific activity on mosquitoes
- Quickly kills mosquito larvae (2–24 hours)
- Increased storage shelf life
- Decreased weight to transport
- Aqueous spray or direct application
- Sprays easily through many equipment types
- Not harmful to non-target organisms
- Results assessed quickly in field
*Source: World Health Organization Onchocerciasis Control Programme (OCP) http://www.who.int/blindness/partnerships/onchocerciasis_OCP/en
VectoBac Aqueous Suspension
VectoBac 12AS (also known as SC; Suspension Concentrate) is an aqueous suspension formulation of Bacillus thuringiensis subsp. israelensis (strain AM65-52) for control of mosquitoes, black flies, and closely related fly larvae. The product has a potency of 1200 International Toxin Units (ITU) per milligram against Aedes aegypti larvae.
VectoBac 12AS is intended for use in aqueous spray applications to habitats with little or no vegetation. Rate selected should be based on habitat, larval population/stage, and/or environmental conditions.
Suggested Rate Range for Mosquito Control:
Use 0.25–2 pints/acre (0.3–2.3 liters/hectare)
VectoBac 12AS is the worldwide standard for biorational control of black fly larvae in rivers. In fact, the particle size and suspension properties of VectoBac 12AS were originally designed for black fly control. In 1974, the World Health Organization initiated the Onchocerciasis Control Program (OCP) in West Africa to combat the devastating effects of river blindness (transmitted by black flies) in that region. The introduction of VectoBac 12AS in the 1980s to this program helped the program virtually eradicate the disease, preventing an estimated 600,000 cases of blindness and making 25 million hectares of land safe for use.*
Suggested Rate Range for Black Fly Control:
- Stream/river water (=ppm) for 1 minute exposure time with 0.5–25 mg/liter
- Stream/river water (=ppm) for 10 minutes exposure time with 0.05–2.5 mg/literUse higher rate range when stream/river contains high concentration of organic materials, algae, or dense aquatic vegetation. Discharge is a principal factor determining carry of Bti. Use higher rate or increase volume by water dilution in low discharge rivers or streams under low volume (drought) conditions.
VectoBac 12AS is also effective for control of select nuisance flies (Psychoda spp., Chironomus spp.) in sewage facilities utilizing trickling filter systems.
Suggested Rate Range for Filter Fly Control:
Use 10–20 mg/liter; per liter of wastewater feed to the filter per 30 minutes. Use a high rate for control of Chironomus spp. Apply undiluted with pre-calibrated pump or other device into the wastewater feeding into the filters for a period of 30 minutes. Repeat applications as needed after 2–4 weeks. Control of Chironomus spp. may take up to 2 weeks.
VectoBac G, GS (formerly CG), and GR are granular formulations of Bacillus thuringiensis subsp. israelensis (strain AM65-52) for control of mosquito larvae. VectoBac GR is the only granule bacterial larvicide to complete the World Health Organization Pesticide Evaluation Scheme. The potency of all three formulations is 200 International Toxin Units (ITU) per milligram against Aedes aegypti larvae. The size, shape, and density of VectoBac granules lessen the potential for off-target application due to aerial drift and enable good penetration of dense vegetation.
Suggested Rate Range:
Use 2.5–20.0 lbs/acre (2.8–22.4 kg/ha) to standing water (including agricultural fields) where mosquito larvae are found. Use 10–20 lbs/acre (11.2–22.4 kg/ha) when late 3rd and early 4th instar larvae predominate, mosquito populations are high, water is heavily polluted (sewage lagoons, animal waste lagoons), and/or algae are abundant.
U.S. Standard Screen
|Bulk Density lbs/ft3
|VectoBac G||First Bti granule established for public health use in the early 1980s; contains both floating and sinking granules to ensure distribution of active ingredient throughout larval feeding zone||5/8 mesh (2.4–4.0 mm)||25 lbs/ft3 (401 kg/m3)|
|VectoBac GS||Smaller granule to ensure maximum coverage at low rates||10/14 mesh (1.4–2.0 mm)||30 lbs/ft3 (480 kg/m3)|
|VectoBac GR||Higher density granule, only granule to complete the WHOPES (World Health Organization Pesticide Evaluation Scheme).||10/20 mesh (0.8–2.0 mm)||43 lbs/ft3 (689 kg/m3)|
* Bulk density numbers are approximations
|Rate in lbs/acre
(kg/hectare) VectoBac G
|VectoBac G (65 granules per gram)*||VectoBac GS (485 granules per gram)*||VectoBac GR (830 granules per gram)*|
|Number of granules per ft2||Number of granules per m2||Number of granules per ft2||Number of granules per m2||Number of granules per ft2||Number of granules per m2|
* Granules per gram and number per ft2 (m2) are approximations
VectoBac DT (U.S.) is a direct tablet formulation of Bacillus thuringiensis subsp. israelensis (strain AM65-52) for control of container-breeding mosquito larvae. The product has a potency of 2,200 International Toxin Units (ITU) per milligram against Aedes aegypti larvae. VectoBac DT consists of only Bti (strain AM65-52) and food-grade (US EPA list 4) inert ingredients.
VectoBac DT is intended for residential use. Do not apply directly to treated, finished water supply systems, as these systems are not considered mosquito breeding sites. For use in artificial containers used for water collection to control container mosquitoes (e.g. Aedes aegypti, Aedes albopictus). Artificial water containers may include drums, storage tanks, jars, rooftop catchments, ornamental fish ponds, ornamental pools or fountains, unused swimming pools, floor drains, and roof gutters.
Suggested Application Rate:
1 tablet per 13.2 gallons (50 L).
Reapply at monthly intervals as needed (when late-stage larval numbers return to pre-treatment threshold levels).