Put in a new Blind this past spring on river I hunt. Blind is situated inside a tump thats freestanding about 10 yds. from woods edge. While building I built a small boardwalk off back of blind to make it easy to get in. Stopped by there last week to check on it and that same viney stuff you have was everywhere on boardwalk and into chicken wire blind walls. Wasn,t there that I remember prior to blind build and cutting enough foliage in tump to install floors & walls. Parasite of some type thats taking advantage of increased sunlight i,m assuming.