most of the modern day flagging tapes are soy or ceulose based products and are designed to be biodegradable and digestable. while it IS VERY unpleasing to the eye and an annoyance, some of it does have meaning and several colors could have been used if the property was surveyed (property lines are generally pink, then a multitude of colors for contour lines, flood plain, flood way, suitable soils for building/perk, internal lot lines, etc)....but since it is public land, probably some sort of marking for another hunter as mentioned earlier.