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The effectiveness at recommended rates of triclopyr/picloram (Tordon Gold), clopyralid (Versatill), metsulfuron (Answer) and glyphosate (Roundup GII) for the control of Californian thistle (Cirsium arvense) using a rotary weed wiper (Rotowiper) was tested in a field experiment. The thistles were treated with either single or double passes at the early post-flowering stage. The pasture height was 5-8 cm and the roller treated all weeds taller than 18 cm. The thistle stem density and botanical composition of the pasture were assessed prior to treatment and throughout a period of 10 months afterwards. All four herbicides were highly effective in reducing the thistle density with over 90% control for the double pass 8 months after application, and over 80% control for the single pass, except for triclopyr/picloram with 68% control. However, 10 months later pasture treated with metsulfuron, clopyralid and picloram/triclopyr still had significantly less clover than before the application. The clover content of glyphosatetreated plots increased significantly 3 months after application, though both glyphosate and metsulfuron caused some short-term grass damage. Possible reasons for the pasture damage are discussed.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Changes in thistle populations between 1984 and 2006 in Canterbury