The Suffolk County Department of Public Works plans to spray portions of 10 North Fork salt marshes by helicopter Tuesday, in an attempt to control mosquito larvae there.
The spraying, which will also take place in Brookhaven and Southampton Towns, will begin at 5 a.m. and continue until 8 p.m.
The spraying will be a low-altitude, large drop liquid application of Altosid liquid concentrate (methoprene), county officials said.
The following is a list of locations where spraying will occur in Riverhead and Southold towns:
Town of Riverhead
Crescent Duck Farm
Town of Southold
Great Hog Neck
Pipes Neck Creek