Wild oat management New options for old chemistry
| Date: 14 Jun 2008
• Results encouraging from both Triflur® Xcel and Avadex® Xtra but NOT silver bullets (will nearly always require a post-emergent clean up)
• Similar results from both products where ‘incorporated by sowing’
• No consistent dose response to either product alone or in mixture
• In chickpeas, under extreme wild oats pressure, an average net benefit of $310/ha was obtained (range $242-373)
• May have better fit in zero/minimum tillage systems
• Industry needs to reduce Group A usage in crops where viable options exist eg in wheat with Group B and K
• Focus must be on reducing the wild oat seedbank and include winter/ summer crop rotations in the north
Richard Daniel, Northern Grower Alliance (NGA)
The weed
The issue
- General lack of competitiveness
- Often produced on wide rows
- Only have Group A herbicides registered for post-emergent control
What was evaluated
Trial
|
NGA0717
|
||
Untreated wild oats density
|
~16 plants/m2
|
||
Product
|
Rate L/ha
|
% control
DAP 65
|
|
Triflur Xcel
|
1.45
|
88
|
bc
|
Triflur Xcel
|
1.9
|
64
|
ab
|
Avadex Xtra
|
1.6
|
75
|
bc
|
Avadex Xtra
|
2.0
|
90
|
bc
|
(Mean of Pre-emergents ALONE)
|
(79)
|
||
Triflur Xcel + Avadex Xtra
|
1.45 + 1.6
|
76
|
bc
|
Triflur Xcel + Avadex Xtra
|
1.45 + 2.0
|
86
|
bc
|
Triflur Xcel + Avadex Xtra
|
1.9 + 1.6
|
94
|
c
|
Triflur Xcel + Avadex Xtra
|
1.9 + 2.0
|
81
|
bc
|
(Mean of Pre-emergent MIXTURES)
|
(84)
|
||
|
P=0.0049
|
Wild oat control in chickpeas
Trial
|
|
NGA0718
|
NGA0719
|
||
Untreated wild oats density
|
|
~1,100 plants/m2
|
~11 plants/m2
|
||
Product
|
Rate L/ha
|
% control
DAP 45
|
% control
DAP 49
|
||
Triflur Xcel
|
1.45
|
49
|
bcd
|
70
|
abc
|
Triflur Xcel
|
T2
|
75
|
cd
|
85
|
bcd
|
Avadex Xtra
|
1.6
|
58
|
bcd
|
85
|
bcd
|
Avadex Xtra
|
A2
|
41
|
bc
|
45
|
ab
|
(Mean of Pre-emergents ALONE)
|
(56)
|
(71)
|
|||
Triflur Xcel + Avadex Xtra
|
1.45 + 1.6
|
62
|
bcd
|
92
|
cd
|
Triflur Xcel + Avadex Xtra
|
1.45 + A2
|
83
|
d
|
96
|
cd
|
Triflur Xcel + Avadex Xtra
|
T2 + 1.6
|
82
|
d
|
97
|
d
|
Triflur Xcel + Avadex Xtra
|
T2 + A2
|
73
|
bcd
|
85
|
bcd
|
(Mean of Pre-emergent MIXTURES)
|
(75)
|
(93)
|
|||
|
P=0.0035
|
P=0.0093
|
Pre-emergents alone under IBS approach:
Pre-emergent mixtures under IBS approach:
Key points:
Final wild oat control
Trial
|
|
NGA0718
|
NGA0719
|
||
Crop
|
|
Chickpeas
|
Chickpeas
|
||
Row spacing
|
|
50 cm
|
50 cm
|
||
Untreated wild oats density
|
|
32 panicles/m2
|
~4 plants/m2
|
||
Product
|
Rate L/ha
|
% control
DAP 128
|
% control
DAP 66
|
||
Triflur Xcel
|
1.45
|
90
|
b
|
91
|
bcd
|
Triflur Xcel
|
T2
|
100
|
c
|
95
|
cd
|
Avadex Xtra
|
1.6
|
98
|
bc
|
84
|
abcd
|
Avadex Xtra
|
A2
|
97
|
bc
|
74
|
abc
|
(Mean of Pre-emergents ALONE)
|
(96)
|
(86)
|
|||
Triflur Xcel + Avadex Xtra
|
1.45 + 1.6
|
98
|
bc
|
95
|
cd
|
Triflur Xcel + Avadex Xtra
|
1.45 + A2
|
100
|
c
|
94
|
cd
|
Triflur Xcel + Avadex Xtra
|
T2 + 1.6
|
97
|
bc
|
98
|
d
|
Triflur Xcel + Avadex Xtra
|
T2 + A2
|
99
|
bc
|
93
|
cd
|
(Mean of Pre-emergent MIXTURES)
|
(99)
|
(95)
|
|||
|
P=0.0011
|
P=0.0093
|
Key points:
Yield and economics
Product
|
Rate L/ha
|
Yield kg/ha
|
Net benefit over untreated $/ha
|
|
Untreated
|
-
|
868
|
b
|
|
Triflur Xcel
|
1.45
|
1450
|
a
|
266
|
Triflur Xcel
|
T2
|
1671
|
a
|
373
|
Avadex Xtra
|
1.6
|
1582
|
a
|
320
|
Avadex Xtra
|
A2
|
1439
|
a
|
242
|
(Mean of Pre-emergents ALONE)
|
(1535)
|
(300)
|
||
Triflur Xcel + Avadex Xtra
|
1.45 + 1.6
|
1667
|
a
|
352
|
Triflur Xcel + Avadex Xtra
|
1.45 + A2
|
1619
|
a
|
322
|
Triflur Xcel + Avadex Xtra
|
T2 + 1.6
|
1512
|
a
|
271
|
Triflur Xcel + Avadex Xtra
|
T2 + A2
|
1640
|
a
|
330
|
(Mean of Pre-emergent MIXTURES)
|
(1609)
|
(319)
|
Conclusions
Acknowledgements
Contact details
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