Effects of herbicides on wallaby grass (Danthonia spp.), 2. Established plants
1994
Lodge, G.M. (New South Wales Agriculture, Tamworth (Australia). Agricultural Research Centre) | McMillan, M.G. (New South Wales Agriculture, Glen Innes (Australia). Agricultural Research and Advisory Station)
Three experiments were conducted at Tamworth, New South Wales, in 1990-92 to assess the effects of a range of broadleaf and grass herbicides, 6 rates of glyphosate and paraquat plus diquat, and 4 rates of 2,4-D amine and diuron on established wallaby grass plants. Phytotoxicity was scored visually on a 0-5 scale. Danthonia dry matter yields were not affected by any herbicide tested, except glyphosate applied at 360 g a.i. per ha or greater. Phytotoxicity was highest for the glyphosate treatment. All rates of glyphosate and paraquat plus diquat rates at 250 plus 150 g a.i. per ha or greater reduced inflorescence number compared with the unsprayed control. Paraquat plus diquat had no significant effect on seed yield, but glyphosate rates of 360 g a.i. per ha or higher reduced seed yield. In 1992, no damage was observed on 2,4-D amine treatments and phytotoxicity scores were low for all diuron treatments. Danthonia inflorescence numbers and seed yields were higher on plots mown in early spring than on unmown treatments. The lack of effect of herbicides such as diclofopmethyl, simazine, fenoxaprop-ethyl, and diuron on Danthonia dry matter yield, and the low phytotoxicity, indicated that a range of chemicals may be used on established swards to control perennial and annual grass weeds. Seed yield was more affected than dry matter yield by herbicide, and paraquat plus diquat should be used in preference to glyphosate on seed crops.
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