Suffolk County vector control is planning to spray area salt marshes Thursday from 5 a.m. to 8 p.m. to target mosquito larvae, health department officials said.

The pesticide Vectobac 12AS is to be sprayed, weather permitting, over marsh areas by helicopter at a low altitude, officials said.

County officials said residents don't need to take any precautions, any human exposure is unlikely, and the pesticide has "no significant human toxicity," officials said.

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Spraying is to be conducted in areas of the towns of Babylon, Islip, Brookhaven, Southampton, East Hampton, Riverhead and Southold.

The division of vector control can be reached at 631-852-4270.