Houston homeowners often ask whether they should focus on larvicide treatment (stopping mosquitoes before they fly) or barrier spray (killing adults). The most effective approach combines both — larvicide to prevent new mosquitoes from emerging and barrier spray to eliminate the adult population already present.
How Larvicide Works
Larvicide products containing Bacillus thuringiensis israelensis (Bti) target mosquito larvae in standing water. The bacteria produce proteins that are toxic to mosquito larvae but harmless to humans, pets, birds, and fish. Larvicide donuts are placed in birdbaths, ornamental ponds, rain barrels, and other water features that cannot be eliminated.
How Barrier Spray Works
Barrier spray uses adulticide products applied to vegetation, fence lines, and shaded areas where adult mosquitoes rest. The spray kills mosquitoes on contact and leaves a residual that continues killing for 3–4 weeks.
The Integrated Approach for Houston Yards
Professional mosquito control programs combine larvicide treatment of all standing water sources with monthly barrier spray applications. This integrated approach eliminates both existing adult mosquitoes and prevents new generations from emerging.