Poa annua control in perennial ryegrass turf

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Poa annua control in perennial ryegrass turf

• Poa annua control trial at NZCHPC 24 June 2005

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Glyphosate 300 ml/ha
Control
Atrazine 500 1 L/ha Glyphosate 300 ml/ha
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Atrazine 500 1 L/ha Goal 1 L/ha Sencor DF 300
g/ha
Atrazine 500 1.5 L/ha
Nortron 4 L/ha Goal 1 L/ha Sencor DF 300 g/ha
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Glyphosate 300 ml/ha Moddus 2 L/ha x2
Karmex 1.5 kg/ha Glyphosate 300 ml/ha
Nortron 4 L/ha
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Sencore DF Glyphosate 300 ml/ha
Glyphosate 300 ml/ha
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Glyphosate 300 ml/ha Moddus 2 L/ha x2
Atrazine 500 1.5 L/ha
Nortron 4 L/ha
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Nortron 4 L/ha Moddus 2 L/ha
Grazon 3 L/ha
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Atrazine 1 L/ha Goal 1 L/ha Sencor DF 300g/ha
Karmex 1.5 kg/ha Glyphosate 300 ml/ha
Goal 1 L/ha Sencor DF 300 g/ha
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Goal 1 L/ha Sencor DF 300g/ha
Nortron 4 L/ha PCB
Nortron 6 L/ha
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Nortron 4 L/ha Glyphosate 300 ml/ha
Nortron 4 L/ha Moddus 2 L/ha
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Nortron 4 L/ha Moddus 2 L/ha
Nortron 4 L/ha Glyphosate 300 ml/ha
Poa annua browned but recovering
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Poa annua healthy in control plots
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Poa reddish brown but recovering in Atrazine
Glyphosate plots
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Poa annua browned but turf thinned in Glyphosate
plots
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Poa browned but recovering in Glyphosate plots
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General view of trial site
General view of trial area at NZCHPC
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Conclusions

• Nortron 6 L/ha - good Poa annua control
• Nortron 4 L/ha fair Poa annua control
• No growth check with Nortron
• No benefit of adding Glyphosate 300ml/ha
• Glyphosate too severe on ryegrass
• Goal 1 L/ha Sencor DF 300 g/ha improved
  effectiveness of Nortron 4l/ha.
• Other products too severe or ineffective.