Mosquito Dunks and Granules for Water Features

Chemical
Effectiveness:
Cost Level
Low
Environmental Impact
Low
Resistance Risk
Low
Target Pests
1 species

Target Pests (1)

Common NameScientific NameCategory
MosquitoCulex pipiensMosquitoes

Application Method

Apply BTI (Bacillus thuringiensis israelensis) mosquito dunks or granules to ornamental ponds, water gardens, bird baths, and other water features that cannot be drained. BTI is biological larvicide containing bacteria that produces toxin affecting only mosquito and fly larvae - safe for fish, wildlife, pets, and beneficial insects. Dunks are donut-shaped floating briquettes that release BTI for 30 days. Granules provide quicker results for immediate problems. Apply per label rates based on water volume and surface area. Treat all standing water that cannot be eliminated: decorative ponds, fountains, rain barrels, water gardens, tree holes filled with water, and low areas that hold water after rain.

Timing

Apply in spring before mosquito breeding begins. Reapply per label schedule (monthly for dunks, weekly for granules).

Frequency

Dunks: replace every 30 days. Granules: reapply every 7-14 days. Continue throughout mosquito season.

Preparation Required

Survey property for all water features and standing water. Calculate number of dunks or amount of granules needed based on water volume. Explain to customer importance of eliminating unnecessary standing water.

Follow-up Required

Monitor treated water for mosquito larvae using dipper. Replace dunks monthly or reapply granules per schedule. Educate customer on DIY application for routine maintenance. Combine with adult mosquito control for comprehensive program.

Safety Precautions

  • Safe for fish, wildlife, and pets
  • Do not contaminate drinking water sources
  • Follow label rates - more is not better
  • Store unused product in original container
Important Disclaimer: The information provided in this knowledge base is for educational and reference purposes only. Pest management professionals should always consult current product labels, Safety Data Sheets (SDS), manufacturer instructions, and applicable local, state, and federal regulations as the definitive source of truth. Product formulations, application methods, safety requirements, and regulations may change over time. This information may be out of date and should not replace professional judgment, proper training, or required licensing and certifications.