Which Bti larvicide to purchase?
Bacillus Thuringiensis, subspecies israelensis
is a biological larvicide granulated for use against mosquito larvae in
the following mosquito habitats: Irrigation ditches, roadside ditches,
flood water pools, standing ponds, snow melt pools, pastures, catch
basins, storm water retention areas.
larvicide comes in a 40-pound bag and should not be repackaged. When
stored in a cool, dry place the product has a shelf life of
approximately 5 years. Application rates vary from 2½ pounds per acre (7
or 8 granules per square foot) to 5 pounds per acre depending on the
breeding habitat. Granules should be applied along the fringes of pools
or creeks where the water is still, over marshy areas, and in low lying
areas that retain water. Re-application may be required every 7 to 10
days from the onset of mosquito season through mid-September when cooler
temperatures cause the mosquitoes to hibernate. A single 40-pound bag
should be sufficient for one season of larvicide application along a
660-feet stretch of creek.
are floating “dunkers”,
sustained-release, Biological Larvicide suitable for use in horse
troughs, stock tanks, or stagnant ponds. A single briquet provides
effective mosquito control for 100 square feet of water for
approximately 21 days. Although
the product poses no risk to wildlife, some animals steal the “dunkers”,
so be vigilant.
glasses or goggles and appropriate clothing when applying the larvicide
as direct contact with eyes or skin may cause mild irritation.
Additional product information is available at