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

Vitelli, J.S.; Mayer, R.J.; Jeffrey, P.L.

Tropical Grasslands 28(2): 120-126


ISSN/ISBN: 0049-4763
Accession: 002622133

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Field trials were conducted at Charters Towers, during 1988-1990 to determine the effectiveness of foliar-applied herbicide treatments at various dose rates for the control of scattered rubber vine (Cryptostegia grandiflora) infestations (<1000 plants/ha). Five treatments (2,4-D + picloram (Tordon 50-D) at 1.33 + 0.33 g/litre, imazapyr (Arsenal 250A) at 1.25 g, metsulfuron (Brush-off) at 0.09 g, triclopyr + picloram (Grazon DS) at 1.5 + 0.5 g and dicamba (Banvel 200) at 2.0 g) killed 90-100% of the treated plants. The other five treatments (2,4-D ethyl ester (Estercide 800) at 8 g, 2,4-D butyl ester (AF Rubber Vine Spray) at 2.0 g, glyphosate (Glyphosate 360) at 3.6 g, fluroxypyr (Starane) at 3.0 g and 2,4-D amine (Amicide 500) at 2.5 g) performed poorly (51, 49, 44, 19 and 18% kill, resp.). The cost of the five effective treatments was $A476-1863/ha, excluding the cost of labour. It was concluded that it would require $A333-1304 million in herbicides alone to treat the current rubber vine infestation in Australia and, even then follow-up action would be necessary. In this context, it is suggested that these herbicides are best seen as useful tools for controlling scattered rubber vine plants. It is concluded that foliar herbicides that kill greater than 90% are tools for controlling scattered rubber vine on higher value land or on strategic parts of properties.