Dorchester County operates a Mosquito Control Program to protect its citizens from the spread of mosquito borne diseases by spraying pesticides (insecticides), applying larvicide to low-lying areas, and educating its citizens on reducing the conditions that foster increases in the mosquito population.

Mosquitoes are a pest that can cause itchy bites, but they can also cause more serious health issues like spreading diseases. The most common diseases that could potentially be carried by mosquitoes in South Carolina include: West Nile, Eastern Equine Encephalitis, La Crosse Encephalitis, Saint Louis Encephalitis, and dog/cat heartworm.


Ground Spraying and Larvicide Briquettes

Dorchester County has two trucks for ground spraying. Beginning in April 2017, personnel will spray 6 zones per night, Monday-Friday from 9:00pm to 5:00am.

The two chemicals used for ground spraying are Permanone Ready-to-Use and Pursuit/4-4 ULV. These are similar chemicals and both chemicals have a quick knock down rate. These two chemicals are for adult mosquitoes, as opposed to larvae.

Dorchester County responds to mosquito complaints in low lying areas, with treatment during the day, using a larvicide chemical to help prevent hatching. The chemical used is Altosid XR Extended Residual Briquettes.


Clemson letter

Clemson letter: Non-Agricultural Follow-Up Pesticide Use Investigation on Aerial Spraying conducted on August 28, 2016.