What are those little round things your workers throw in ditches?
B.t.i Briquets or Bacillus thuringiensts. The briquets are used for the control of mosquito larvae. They are placed in standing water and roadside ditches where mosquito larvae tend to grow.

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1. When do you spray for mosquitoes? How can I get my neighborhood sprayed for mosquitoes?
2. What chemical do you use to spray for mosquitoes?
3. What are those little round things your workers throw in ditches?
4. What do I need to do if I am sensitive to chemicals or do not want my neighborhood to be sprayed for mosquitoes?