TOxICOLOGICAL PROPeRTIeS - Bayer CropScience

WEED CONTROL – EFFICACY
The efficacy of Cheetah Gold is related to growing
conditions. Results under poor growth situations (e.g.
low or excess moisture, temperatures not favourable to
weed growth or poor nutrition) may be inferior to those
achieved under good conditions. High temperatures
(>25°C) do not favour the growth of ryegrass, so the
herbicidal effect may be reduced. The effect on young
plants is always better than on old plants.
Graph 1. Annual ryegrass control with Cheetah Gold
% annual ryegrass control
100
95
90
85
80
75
70
65
Cheetah Gold
1 L/ha #
Trial ID: 04NW16, 04VB12, 06NB01, 06NB22
Achieve ®
Cheetah Gold
380 g/ha ¤ 1 L/ha #
Trial ID: 05NW16, 05NW17, 05VA17
Mild, wet weather encourages plant growth and
increases the activity of Cheetah Gold. Hot, dry or
excessively cold weather slows activity.
Annual ryegrass
Cheetah Gold is an excellent herbicide for the control
of annual ryegrass. Cheetah Gold has a unique
combination of a ‘fop’ & ‘dim’ Group A chemicals to
provide this control in wheat and barley.
Axial ®
300 mL/ha*
# Hasten 1% v/v or Uptake 0.5% v/v *Adigor ® 0.5% v/v ¤ Supercharge ® 0.75% v/v
Cheetah Gold
1 L/ha #
Tristar ® Advance
1.5 L/ha
Trial ID: 04NW16, 04WA11, 04NB08, 04VB12, 05VA15, 05VB06,
05NW16, 05NW17, 05VA16, 05VA17, 05NB06, 05NB04, 05NB12,
06NB01, 06NB02, 06NB22
Cheetah Gold is not a suitable herbicide where resistance levels to Group A products are high, with Cheetah Gold
showing a slight improvement over Tristar Advance.
Graph 2. Cheetah Gold versus Tristar Advance
% annual ryegrass control
100
90
80
70
60
50
04NB08
04VB12
05VB06
During 2006, a glasshouse study was conducted by
researchers at Charles Sturt University. Ten annual
ryegrass samples were sprayed with Cheetah Gold,
Achieve and Axial. Five of the annual ryegrass samples
were ‘fop’ resistant and five were both ‘fop’ and ‘dim’
resistant. Cheetah Gold, being a mixture of a ‘fop’ and
‘dim’ herbicide, did not effectively control the ‘fop’ and
‘dim’ resistant annual ryegrass, as shown by the graph
below. Despite Achieve and Axial providing slightly
better levels of control than Cheetah Gold, the results
would still be considered commercially unacceptable.
05VA15
05NW16
05NB06
05NB04
Trial ID
Resistance developing
05NW17
% annual ryegrass control
05NB12
04WA11
05VA17
04NW16
05VA16
05VB07
Graph 3. Performance of Cheetah Gold on
confirmed resistant annual ryegrass
100
90
80
70
60
50
40
30
Cheetah Gold Achieve Axial
1 L/ha # 380 g/ha ¤ 300 mL/ha*
Trial ID: Screening of Group A resistant annual ryegrass samples to
selected herbicies, 2006. Charles Sturt University.
Highest
result
Average
result
Lowest
result
Cheetah
Gold
1 L/ha
(Hasten
1% v/v or
Uptake
0.5% v/v)
Tristar
Advance
1.5 L/ha
Highest
result
Average
result
Lowest
result
# Hasten 1% v/v *Adigor 0.5% v/v ¤ Supercharge 0.75% v/v
Wild oats
Cheetah Gold provides excellent control of wild oats.
Graph 4. Wild oat control with Cheetah Gold
% wild oat control
% wild oat control
100
95
90
85
80
75
70
65
100
95
90
85
80
75
70
65
Cheetah Gold
1 L/ha #
Trial ID: 04VB06, 04VB12, 05NB05, 05NB07, 05QG22,
06NB01, 06NB22
Cheetah Gold
1 L/ha #
Trial ID: 04ND01, 04SA43, 04NB08, 05NB05, 06NB01, 06NB02,
06NB22
Achieve
Cheetah Gold
380 g/ha ¤ 1 L/ha
Axial
200 mL/ha*
Trial ID: 05ND12, 05VB07, 05QG22, 05NB11, 05NB12. 06NB01,
06NB02, 06NB22
# Hasten 1% v/v or Uptake 0.5% v/v *Adigor 0.5% v/v ¤ Supercharge 0.75% v/v
Wildcat ®
Cheetah Gold
300 mL/ha † 1 L/ha
# Hasten 1% v/v † BS1000 ® 0.25% v/v ** Hasten 0.5% v/v
Annual phalaris
Topik ®
65 mL/ha **
Trial ID: 04NB08, 05NB05, 06NB01, 06NB02, 06NB22
The performance of Cheetah Gold on annual phalaris is
variable, as demonstrated by the control achieved in the
trials below. Bayer CropScience can therefore only make
a suppression claim.
Graph 5. Annual-phalaris control with Cheetah Gold
% annual phalaris control
100
95
90
85
80
75
70
65
Cheetah Gold
1 L/ha #
Axial
200 mL/ha*
Trial ID: 05QG22, 05NB12, 06ND11, 06NW17, 06NB01
# Hasten 1% v/v *Adigor 0.5% v/v
Cheetah Gold
1 L/ha
Hussar ®
200 g/ha #
Trial ID: 04NB10, 05QG22, 05NB04, 05NB12,06ND11, 06NW17,
06NB01, 06NB10
Cheetah Gold
1 L/ha #
Tristar Advance
1.5 L/ha
Trial ID: 04ND01, 04NW15, 04WB13, 04VB11, 04SA43, 04QG04,
04NB08, 04VB06, 04VB12, 05ND09, 05WA15, 05VB06, 05SA12,
05NW14, 05ND11, 05ND12, 05VA16, 05VA17, 05VB07, 05SA15,
05QG22, 05NB05, 05NB07, 05NB11, 05NB12, 06NB01, 06NB02,
06NB22
Highest
result
Average
result
Lowest
result
Highest
result
Average
result
Lowest
result
Highest
result
Average
result
Lowest
result