It is effective against several types of mosquitoes, including the Culex species that carried the West Nile Virus last summer. They will also provide protection through the early insect breeding season. It is effective if used early before adult mosquitoes develop. This will help reduce the need to use other pesticides against adult mosquitoes later in the summer. It is one of the most important steps in preventing the re-emergence of West Nile virus.
Direct contact can cause mild eye and skin irritation, but no known serious effects.
It has, however, been reported to be slightly toxic to freshwater fish and birds. It does not remain in the ground. The larvicides are being applied in storm drains, catch basins and other areas to which the general public does not have access. These areas drain into river water and sewage treatment plants. If the symptoms persist, first contact your local doctor or emergency department, then contact the New York City Poison Control Center.