Field Pea Blackspot Management Guide is a location and season specific weekly forecast. It accounts for varietal resistance and chemical options, agronomic yield potentials, agronomic constraints (frost and terminal drought), risks of spores showers, disease severity, and disease related yield loss. It then weighs agronomic yield loss and disease yield loss and suggests a window of sowing dates.
High blackspot risk for 2018
Early forecasts point to a high risk of blackspot in seedling field pea crops across most of South Australia in 2018. The extremely dry summer and autumn has delayed the maturation of blackspot spores on field pea stubbles. This means the spores will be released with rainfall in late autumn and winter, when the new crops are emerging and establishing. Growers should prepare for a high risk of blackspot establishing in their crops.
For information on blackspot management, refer to High blackspot risk forecast for SA in 2018. [1]
Key to blackspot severity scores
| Blackspot severity | 5 out of 10 years | 3 out of 10 years | 1 out of 10 years |
|---|---|---|---|
| 1 | 0 | 0 | 0 |
| 2 | 2 | 5 | 15 |
| 3-4 | 20 | 25 | 35 |
| 5 | 25 | 30 | 50 |
Balaklava
Rainfall to date: 20mm; days with significant stubble moisture: 14
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Blyth
Rainfall to date: 26mm; days with significant stubble moisture: 32
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 3-4 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | Medium |
Bordertown
Rainfall to date: 22mm; days with significant stubble moisture: 21
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Clare
Rainfall to date: 20mm; days with significant stubble moisture: 7
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 3-4 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | Medium |
Crystal Brook
Rainfall to date: 20mm; days with significant stubble moisture: 7
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Eudunda
Rainfall to date: 39mm; days with significant stubble moisture: 26
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Keith
Rainfall to date: 17mm; days with significant stubble moisture: 11
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Kent Town
Rainfall to date: 19mm; days with significant stubble moisture: 12
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Kimba
Rainfall to date: 24mm; days with significant stubble moisture: 8
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Kingsford
Rainfall to date: 32mm; days with significant stubble moisture: 34
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 3-4 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | Medium |
Kyancutta
Rainfall to date: 27mm; days with significant stubble moisture: 15
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Lameroo
Rainfall to date: 10mm; days with significant stubble moisture: 7
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Lock
Rainfall to date: 35mm; days with significant stubble moisture: 21
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Maitland
Rainfall to date: 33mm; days with significant stubble moisture: 30
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 3-4 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | Medium |
Mannum
Rainfall to date: 21mm; days with significant stubble moisture: 16
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Minlaton
Rainfall to date: 14mm; days with significant stubble moisture: 13
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Minnipa
Rainfall to date: 23mm; days with significant stubble moisture: 16
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Mount Barker
Rainfall to date: 41mm; days with significant stubble moisture: 43
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 3-4 | 3-4 | 2 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | Medium | Medium | Low |
Murray Bridge
Rainfall to date: 20mm; days with significant stubble moisture: 15
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Mypolonga
Rainfall to date: 19mm; days with significant stubble moisture: 10
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Naracoorte
Rainfall to date: 31mm; days with significant stubble moisture: 34
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 3-4 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | Medium |
Palmer
Rainfall to date: 27mm; days with significant stubble moisture: 24
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 3-4 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | Medium |
Port Broughton
Rainfall to date: 26mm; days with significant stubble moisture: 15
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Riverton
Rainfall to date: 34mm; days with significant stubble moisture: 27
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Snowtown
Rainfall to date: 32mm; days with significant stubble moisture: 27
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Tumby Bay
Rainfall to date: 16mm; days with significant stubble moisture: 8
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Yeelanna
Rainfall to date: 28mm; days with significant stubble moisture: 16
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
Yorketown
Rainfall to date: 13mm; days with significant stubble moisture: 6
| Weekly forecast | 9 April | 16 April | 23 April |
|---|---|---|---|
| Blackspot severity | 5 | 5 | 5 |
| Sowing guide (based on agronomic suitability) | Too early to sow | Too early to sow | Too early to sow |
| Blackspot risk | High | High | High |
More Information
For more information contact Dr Jenny Davidson [2] at SARDI on ph +61 (0)8 8303 9389.
[3]
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