Gardner, D. E. . Unpublished: Fountain grass herbicide study. Hawaii Volcanoes National Park. Unpublished
ABSTRACT
During the late 1970s, fountain grass (Pennisetum setaceum) was becoming recognized as presenting a serious invasive threat to the drier areas of HAVO, the extensive Ka`u Desert in particular. Fountain grass, introduced to Hawaii as an ornamental, had already spread widely in the drier, recent lava substrate on the western coasts of Hawaii Island. At the time, it was difficult to locate fountain grass within the park; thus, I located several clumps of this species outside the western boundary for experimentation with herbicides. As with most such herbicidal studies, materials available for use were limited by those approved by the Washington office for application in NPS areas. Roundup (glyphosate) was one of the relatively few that seemed to have almost universal approval. Aside from its general effectiveness on a wide range of nonnative invaders, it was quickly broken down in the soil and thus considered relatively safe for the environment. My studies indicated that Roundup was effective on fountain grass.
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