The Permian Basin Boll Weevil Eradication Zone shall consist of the following area originally included as a part of the Southern High Plains/Caprock Eradication Zone described at the Texas Agriculture Code, §74.1021(e): all of Dawson, Ector, Howard and Martin Counties; all of Borden County except all land east of a line 7 miles west of the Scurry County line that runs from the Garza County line to the Howard County line; and all of Midland County except for the southern region located south of a line 15 miles south of Interstate 20 running from the Ector County line east to the Glassock County line.