Tropical Grasslands (1994) Volume 28, 120–126

Foliar application of 2,4-D/picloram, imazapyr, metsulfuron, triclopyr/picloram, and dicamba kills individual rubber vine (Cryptostegia grandiflora) plants


1Department of Lands, Tropical Weeds Research Centre, Charters Towers, Queensland, Australia
2Department of Primary Industries, Oonoonba Veterinary Laboratory, Townsville, Queensland, Australia


As part of a program to develop effective and affordable integrated pest management systems for the control of rubber vine (Cryptostegia grandiflora), 10 foliar-applied herbicides were trialled at various dose rates in north Queensland to determine their effectiveness in controlling scattered rubber vine infestations (< 1000 plants/ha). Five herbicides (2,4-D/picloram (Tordon 50-D) at 1.33/0.33 g/L, imazapyr (Arsenal 250A) at 1.25 g/L; metsulfuron (Brush-Off) at 0.09 g/L; triclopyr/picloram (Grazon DS) at 1.5/0.5 g/L; and dicamba (Banvel 200) at 2.0 g/L) killed 90–100% of the treated plants. The other 5 herbicides (2,4-D ethyl ester (Estercide 800) at 8 g/L (51% kill); 2,4-D butyl ester (AF Rubber Vine Spray) at 2.0 g/L (49%); glyphosate (Glyphosate 360) at 3.6 g/L (44%); fluroxypyr (Starane) at 3.0 g/L (19%); and 2,4-D amine (Amicide 500) at 2.5 g/L (18%)) performed poorly. The chemical cost of the 5 effective herbicides is $476–1863/ha, excluding cost of labour. It would require $333–1304 million in herbicides alone to treat the current rubber vine infestation and even then, follow-up action would be necessary. In this context, these herbicides are best seen as useful tools for controlling scattered rubber vine plants. Foliar herbicides producing kills greater than 90% remain tools for controlling scattered rubber vine on higher value land or on strategic parts of properties.

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