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Boll Weevil Eradication Foundation of Georgia About BWEF of GA The Boll Weevil The boll weevil can range from 18 to 13 inch in length and the color varies due to the age. Young adult weevils are reddish in color and are soft. Within a day they begin to change to a grayish brown and the shell hardens. The thin slightly curved snout is about half the length of the body.