Chemical Control of Blue Periwinkle (Vinca major L.) in Croajingolong National Park, Victoria

Blue periwinkle (Vinca major) is a serious environmental weed of protected areas in Eastern Australia. A trial to evaluate the effectiveness of glyophosphate, metsulfuron methyl, chlopyralid and trichlopyr for controlling this weed was undertaken east of Mallacoota Inlet within Croajingolong National Park, Victoria. The herbicides had their greatest effect six months after treatment. Brown-out at that time was 96% with glyphosphate 360 g per 100 L, 59% with triclopyr at 126 g per 100 L, 23% with clopyralid at 150 g per 100 L and negligible with metsulfuron methyl at 6 g per 100 L