Stripe rust management Prevention is generally best
| Date: 14 Jun 2008
Richard Daniel, Northern Grower Alliance (NGA)
• Early or preventative foliar sprays, applied from GS32 onwards on moderately susceptible varieties, have provided the best returns in northern trials over the last three years
• High grain prices and low fungicide costs mean breakeven yield benefits required are often only 1-2%
• Application can be the major cost of treatment
• Consider timing when stripe rust in area but not yet in crop or in tank mixture with a late herbicide, near GS32, to eliminate extra application cost
• If not preventative, need to ensure response is very rapid for most economic stripe rust management
• A second spray may still be necessary in high disease seasons
Background
So what has changed in recent years?
What are realistic yield benefit expectations?
Year
|
Organisation
|
Location
|
Variety
(resistance rating)
|
% yield benefit
|
Actual benefit
kg/ha
|
2005
|
NSW DPI
|
Tamworth
|
Baxter (4)
|
29*
|
-
|
2006
|
QDPI&F
|
Gatton
|
Baxter (4)
|
7
|
219
|
Warwick
|
Petrie (3)
|
6
|
182
|
||
Warwick
|
Baxter (4)
|
4
|
139
|
||
Warwick
|
Baxter (4)
|
-1
|
-19
|
||
NGA
|
Bellata
|
Clearfield JNZ (4)
|
5
|
118
|
|
Bellata
|
Baxter (4)
|
11
|
223
|
||
2007
|
QDPI&F
|
Warwick
|
Lang (5)
|
5
|
185
|
Warwick
|
EGA Wylie (4)
|
13
|
490
|
||
Warwick
|
Petrie (3)
|
12
|
365
|
||
Gatton
|
Lang (5)
|
0
|
0
|
||
Gatton
|
EGA Wylie (4)
|
13
|
585
|
||
Gatton
|
Petrie (3)
|
11
|
415
|
||
|
|
|
Average
|
7
|
242
|
The economics of management
Grain price $/t
|
Crop yield kg/ha
|
||||
1000
|
2000
|
3000
|
4000
|
5000
|
|
100
|
70
|
35
|
23
|
18
|
14
|
200
|
35
|
18
|
12
|
9
|
7
|
350
|
20
|
10
|
7
|
5
|
4
|
Grain price $/t
|
Crop yield kg/ha
|
||||
1000
|
2000
|
3000
|
4000
|
5000
|
|
100
|
46
|
23
|
15
|
12
|
9
|
200
|
23
|
12
|
8
|
6
|
5
|
350
|
13
|
7
|
4
|
3
|
3
|
Grain price $/t
|
Crop yield kg/ha
|
||||
1000
|
2000
|
3000
|
4000
|
5000
|
|
100
|
16
|
8
|
5
|
4
|
3
|
200
|
8
|
4
|
3
|
2
|
2
|
350
|
5
|
2
|
2
|
1
|
1
|
Preventative may be best but what is the cost if you get it wrong?
|
Strategy
|
At planting
|
Foliar timing & rate
|
No treatment
|
Untreated
|
-
|
-
|
Foliar fungicide only
|
Early foliar (low rate)
|
-
|
T1 low
|
Late foliar (low rate)
|
-
|
T2 low
|
|
Late foliar (high rate)
|
-
|
T2 high
|
|
Two sprays (low rate)
|
-
|
T1 low + T2 low
|
|
At planting +/- foliar fungicide
|
At planting
|
ü
|
-
|
At planting + early foliar (low rate)
|
ü
|
T1 low
|
|
At planting + late foliar (low rate)
|
ü
|
T2 low
|
Strategy
|
Product
|
Rate
|
At planting
|
Jockey®
|
300 mL/100 kg seed
|
Foliar (low rate)
|
Folicur®
|
145 mL/ha
|
Foliar (high rate)
|
Folicur®
|
290 mL/ha
|
What did we find?
Grain yield
Commercial outcome
Key stripe rust management options
Strategy
|
Advantages
|
Disadvantages
|
Resistant variety
|
|
|
‘At planting’
|
|
|
Foliar preventative (after GS32)
|
|
|
Foliar reactive
|
|
|
Conclusions
- Broadly identifies the level of likely yield loss
- Confirms the benefit of foliar application before or in the early stages of disease development
- Even provides some information on what to expect if the disease fails to develop
Acknowledgements
Contact details
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