Rainforest "weedbusters" chop & apply herbicide to invasive weeds. The ?weedbusters? of Volcanoes National Park on the island of Hawaii defend the park from the most vexatious invasive plants (Chris Zimmer and Lowell Thomas, rear; Kim Tavares and Bob Mattos, front). They are National Park employees who use machetes and weed killing chemicals to rid sections of forest of non-native invasive plants such as Kahili Ginger, Banana Poka, and Kikuyu (African grass)..Volcano National Park, Big Island, Hawaii. USA. MODEL RELEASED..